๐Ÿ•ถ๏ธ The game screen is very small (corresponding to the specifications of the NES, whose display is 256ร—240 pixels). A bird's-eye view of a Zelda-style game, where Link (the protagonist) is walking along a paved road, approaching a house in the middle of the woods. A mini-map at top left suggests a very large map.

๐Ÿ“š๏ธ ZQuest Classic is a libre, multi-platform, mature action-RPG engine, that comes with a clone of the NES version of The Legend of Zelda (1986, Nintendo). It lets you play numerous games (700 quests as of June 2023, mostly Zelda-like) designed by the community, and easily develop them thanks to its comprehensive, intuitive editor, which requires no programming (apart from the optional scripting language for extended functions), and also delivers data sets (traditional/improved). The project has brought together a community that has developed significant content, and its development is sustained.
๐Ÿ•ถ๏ธ The game screen is very small (corresponding to the specifications of the NES, whose display is 256ร—240 pixels). A bird's-eye view of a Zelda-style game, where Link (the protagonist) is walking along a paved road, approaching a house in the middle of the woods. A mini-map at top left suggests a very large map. ๐Ÿ“š๏ธ ZQuest Classic is a libre, multi-platform, mature action-RPG engine, that comes with a clone of the NES version of The Legend of Zelda (1986, Nintendo). It lets you play numerous games (700 quests as of June 2023, mostly Zelda-like) designed by the community, and easily develop them thanks to its comprehensive, intuitive editor, which requires no programming (apart from the optional scripting language for extended functions), and also delivers data sets (traditional/improved). The project has brought together a community that has developed significant content, and its development is sustained.
๐Ÿ•ถ๏ธ A view of its IU with on the main part, a top view where the protagonist - in the center, has just tested and abandoned on the ground many AK47 (he still holds one in each hand) in a futuristic room with other equipment laid on tables (first aid kits, weapons, gloves, bags, ....). At the bottom center a small interface shows the weapons carried and their loading status. At the top left, buttons to access the menus, at the top right a log window, and at the bottom right a small interface summarizing the equipment carried.

๐Ÿ“š๏ธ Space Station 14 is a libre, multi-platform online sandbox action RPG (derived from the game Space Station 13, which it improves and liberates) where players live aboard a space station, all with great freedom of action and scenarios (depending on the servers). Some players play as members of the space station, with different roles assigned, others are assigned antagonistic roles, with the objective of disrupting the station's mission. It can also be played as a simple shooter on the same station! Excellent!
๐Ÿ•ถ๏ธ A view of its IU with on the main part, a top view where the protagonist - in the center, has just tested and abandoned on the ground many AK47 (he still holds one in each hand) in a futuristic room with other equipment laid on tables (first aid kits, weapons, gloves, bags, ....). At the bottom center a small interface shows the weapons carried and their loading status. At the top left, buttons to access the menus, at the top right a log window, and at the bottom right a small interface summarizing the equipment carried. ๐Ÿ“š๏ธ Space Station 14 is a libre, multi-platform online sandbox action RPG (derived from the game Space Station 13, which it improves and liberates) where players live aboard a space station, all with great freedom of action and scenarios (depending on the servers). Some players play as members of the space station, with different roles assigned, others are assigned antagonistic roles, with the objective of disrupting the station's mission. It can also be played as a simple shooter on the same station! Excellent!
๐Ÿ•ถ๏ธ A diagonal downward view of Jack and Daxter aboard a flying motorcycle, flying over a village with various passers-by idle in their daily occupations.

๐Ÿ“š๏ธ Jak and Daxter series is a PlayStation 2 action-platformer and adventure trilogy published between 2001 and 2004 (Naughty Dog studio) following the eponymous protagonists. Falling into a vat of Dark Eco (the antithesis of White Eco, and the 4th - malignant - variation of this form of energy), Daxter is transformed into an otter. Discovering a time machine, Jak (aka Mar) and Daxter embark on an adventure to restore his human form... OpenGOAL is a reverse-engineering of the game, followed by the writing of a GOAL compiler (the game is written in GOAL, a derivative of Lisp) to produce a libre, multi-platform (Windows & Linux), compatible and modern engine.
๐Ÿ•ถ๏ธ A diagonal downward view of Jack and Daxter aboard a flying motorcycle, flying over a village with various passers-by idle in their daily occupations. ๐Ÿ“š๏ธ Jak and Daxter series is a PlayStation 2 action-platformer and adventure trilogy published between 2001 and 2004 (Naughty Dog studio) following the eponymous protagonists. Falling into a vat of Dark Eco (the antithesis of White Eco, and the 4th - malignant - variation of this form of energy), Daxter is transformed into an otter. Discovering a time machine, Jak (aka Mar) and Daxter embark on an adventure to restore his human form... OpenGOAL is a reverse-engineering of the game, followed by the writing of a GOAL compiler (the game is written in GOAL, a derivative of Lisp) to produce a libre, multi-platform (Windows & Linux), compatible and modern engine.
Super Mario Bros. X - (TheXTech v1.3.6) New Super Mario Bros. X
Super Mario Bros. X Gameplay - Airship Attack (Super Mario ReInvent v1.1 (Build))
๐Ÿ•ถ๏ธ A side view of the demo delivered with the engine (called Adventure of Demo, X-Tech engine version 1.3.4, tested on my Linux PC). It's a Mario-like game, but with its own original content, and the whole thing is really neat. There are cakes to collect on and under the platform.

๐Ÿ“š๏ธ TheXTech is a libre and multi-platform engine (and game), allowing the creation of games similar to Super Mario Bros. It is a faithful rewriting (but in C++, and multi-platform) of the SMBX engine, a Super Mario Bros engine written by fans (in VB6, only for Windows). TheXTech will remain the "vanilla" version (the equivalent of Chocolate Doom for Doom), with gameplay faithful to SMBX, while the PGE engine (from the same authors) is an improved version (the equivalent of GZDoom for Doom). TheXTech comes with a very impressive demo, allowing you to play Super Mario Bros, in solo or multiplayer, with many levels, in windowed or full screen, with the keyboard or the gamepad. Excellent!
๐Ÿ•ถ๏ธ A side view of the demo delivered with the engine (called Adventure of Demo, X-Tech engine version 1.3.4, tested on my Linux PC). It's a Mario-like game, but with its own original content, and the whole thing is really neat. There are cakes to collect on and under the platform. ๐Ÿ“š๏ธ TheXTech is a libre and multi-platform engine (and game), allowing the creation of games similar to Super Mario Bros. It is a faithful rewriting (but in C++, and multi-platform) of the SMBX engine, a Super Mario Bros engine written by fans (in VB6, only for Windows). TheXTech will remain the "vanilla" version (the equivalent of Chocolate Doom for Doom), with gameplay faithful to SMBX, while the PGE engine (from the same authors) is an improved version (the equivalent of GZDoom for Doom). TheXTech comes with a very impressive demo, allowing you to play Super Mario Bros, in solo or multiplayer, with many levels, in windowed or full screen, with the keyboard or the gamepad. Excellent!
๐Ÿ•ถ๏ธ A view of its user interface (v.5.6.249, on a dark theme, taken from the website) with the game scene in the center of the screen (2/3 of the screen, representing a water recreation area with a predominance of blue) and the settings menus on either side, with the main icons, buttons, and tabs above.

๐Ÿ“š๏ธ GDevelop is a libre (with additional paid features), multi-platform, mature, game engine & IDE, dedicated to the creation of multi-platform and/or HTML5 2D (and even 3D) games without programming knowledge, via an intuitive and powerful event-based system. The games created are royalty-free and license-free. In addition to its event-based system, it implements the JavaScript language to allow advanced users to extend its possibilities. It offers a resource manager (images, sounds, fonts, and access to a resource pack store), a scene editor (to position objects), an object editor (object creation), a layer editor (display layers), and an event editor (conditions & actions).
๐Ÿ•ถ๏ธ A view of its user interface (v.5.6.249, on a dark theme, taken from the website) with the game scene in the center of the screen (2/3 of the screen, representing a water recreation area with a predominance of blue) and the settings menus on either side, with the main icons, buttons, and tabs above. ๐Ÿ“š๏ธ GDevelop is a libre (with additional paid features), multi-platform, mature, game engine & IDE, dedicated to the creation of multi-platform and/or HTML5 2D (and even 3D) games without programming knowledge, via an intuitive and powerful event-based system. The games created are royalty-free and license-free. In addition to its event-based system, it implements the JavaScript language to allow advanced users to extend its possibilities. It offers a resource manager (images, sounds, fonts, and access to a resource pack store), a scene editor (to position objects), an object editor (object creation), a layer editor (display layers), and an event editor (conditions & actions).
๐Ÿ•ถ๏ธ An aerial view of a camp on a plain protected for the most part (notably its power plant) by a semi-transparent anti-missile dome. On the ground, combat units are moving away to the east, and in the air, a ship is approaching from the northeast. Numerous ground-to-ground and ground-to-air cannons surround the camp.

๐Ÿ“š๏ธ Zero-K is a (partially, see Wikipedia for the sound: CC BY-NC-ND) libre, multi-platform, single-player / multi-player RTS game with a sci-fi theme, a simple economy based on metal & energy, and featuring classic gameplay (4X for map supremacy) or tower defense (vs. increasingly powerful waves of monsters). The player starts with a mecha, extracts resources, builds his army and faces adversity on land, air & sea. A mature game designed by and for gamers, with 70+ missions, 100+ units, a clear interface, and an accomplished lobby client (solo/multi up to 32 players, co-op vs. other players and/or AIs, PVP, campaigns, content & player rating, content loading, fine tuning, ...). Fantastic!
๐Ÿ•ถ๏ธ An aerial view of a camp on a plain protected for the most part (notably its power plant) by a semi-transparent anti-missile dome. On the ground, combat units are moving away to the east, and in the air, a ship is approaching from the northeast. Numerous ground-to-ground and ground-to-air cannons surround the camp. ๐Ÿ“š๏ธ Zero-K is a (partially, see Wikipedia for the sound: CC BY-NC-ND) libre, multi-platform, single-player / multi-player RTS game with a sci-fi theme, a simple economy based on metal & energy, and featuring classic gameplay (4X for map supremacy) or tower defense (vs. increasingly powerful waves of monsters). The player starts with a mecha, extracts resources, builds his army and faces adversity on land, air & sea. A mature game designed by and for gamers, with 70+ missions, 100+ units, a clear interface, and an accomplished lobby client (solo/multi up to 32 players, co-op vs. other players and/or AIs, PVP, campaigns, content & player rating, content loading, fine tuning, ...). Fantastic!
๐Ÿ•ถ๏ธ In the background a bird's eye view of a landscape map with monuments, ancient buildings and what appear to be monsters, in the foreground and to the right the command interface and in the center the fantasy units and the counting of available resources.

๐Ÿ“š๏ธ Heroes of Might and Magic III (Heroes of Might and Magic III: The Restoration of Erathia, Heroes III, HoMM3) is the 3rd installment of a series of medieval fantasy turn-based strategy games released in 1999, in which the player leads a number of heroes commanding their legion of creatures in a crusade to help Queen Catherine Ironfist reclaim her lands conquered by hordes of undead led by Gryphonheart, her late father, former King of Erathia, who was murdered by traitors and resurrected as the undead. VCMI is a libre, multi-platform, compatible and improved engine (high resolution support, advanced and easy mod support, random map generator, zoom, ...).
๐Ÿ•ถ๏ธ In the background a bird's eye view of a landscape map with monuments, ancient buildings and what appear to be monsters, in the foreground and to the right the command interface and in the center the fantasy units and the counting of available resources. ๐Ÿ“š๏ธ Heroes of Might and Magic III (Heroes of Might and Magic III: The Restoration of Erathia, Heroes III, HoMM3) is the 3rd installment of a series of medieval fantasy turn-based strategy games released in 1999, in which the player leads a number of heroes commanding their legion of creatures in a crusade to help Queen Catherine Ironfist reclaim her lands conquered by hordes of undead led by Gryphonheart, her late father, former King of Erathia, who was murdered by traitors and resurrected as the undead. VCMI is a libre, multi-platform, compatible and improved engine (high resolution support, advanced and easy mod support, random map generator, zoom, ...).
๐Ÿ•ถ๏ธ A view of its UI at startup, with "Game Select" (enabled by default), "PWAD Select", "Game Options" and "Resource Locations" tabs. On the activated tab, the identified/set content is displayed (DOOM Shareware v1.9, Freedoom: Phase 2 v0.12.1, ...). At the bottom of the UI, a "Don't Show This Again" checkbox, and "Quit" and "Play!" buttons.

๐Ÿ“š๏ธ Odamex is a libre, multi-platform, single-player / multi-player Doom source port, focusing on online play (up to 255 players in client/server mode, on-the-fly WAD download) and the feel of the original version, while improving it (removing its limitations, new security features, editing and game options).  It is compatible with Doom 1 (Ultimate Doom) & 2, Final Doom, Doom Shareware, FreeDoom, and Chex Quest. It supports modern hardware (joysticks, widescreens, Ultra-High Resolution up to 8K, 32-bit rendering & true color, ...), new game modes (Horde, Survival, Last Man Standing, ...) and competition features (warm-up, rounds, player queues, ...).
๐Ÿ•ถ๏ธ A view of its UI at startup, with "Game Select" (enabled by default), "PWAD Select", "Game Options" and "Resource Locations" tabs. On the activated tab, the identified/set content is displayed (DOOM Shareware v1.9, Freedoom: Phase 2 v0.12.1, ...). At the bottom of the UI, a "Don't Show This Again" checkbox, and "Quit" and "Play!" buttons. ๐Ÿ“š๏ธ Odamex is a libre, multi-platform, single-player / multi-player Doom source port, focusing on online play (up to 255 players in client/server mode, on-the-fly WAD download) and the feel of the original version, while improving it (removing its limitations, new security features, editing and game options). It is compatible with Doom 1 (Ultimate Doom) & 2, Final Doom, Doom Shareware, FreeDoom, and Chex Quest. It supports modern hardware (joysticks, widescreens, Ultra-High Resolution up to 8K, 32-bit rendering & true color, ...), new game modes (Horde, Survival, Last Man Standing, ...) and competition features (warm-up, rounds, player queues, ...).