Hero of Allacrost

Hero of Allacrost, or simply Allacrost, is a 2D single-player RPG licensed under the GNU General Public License and was founded by Tyler Olsen in June 2004.

The team's official description of the game is as follows:

Hero of Allacrost is a single player 2D role-playing game that shares similar appearance and gameplay with classic console RPGs. In Hero of Allacrost, the player will explore rich environments, solve challenging dungeon puzzles, and fight strategic battles in an active-time based system.

The game will be released in modules, rather than waiting until the entire game is finished to make a release. Once a new module is released, players can download it and install it, which will make more content available for the player to continue the game from where they last saved. Each Allacrost release will contain a new chapter of the story. Each section is released when it is completely finished.

It is written in the C++ and Lua programming languages using the SDL library.

Source: https://libregamewiki.org/Hero_of_Allacrost