iQPuzzle is a free and open source I.Q. challenging pentomino puzzle game for Windows, Linux and MacOS. In this game the pentominos are used as puzzle pieces and it comes with more than 300 different board shapes to play this game. You can also create you own levels and configure block move, rotate and flip. It is released under GNU General Public License v3.0
osu! is a free and open source free to win rhythm game for Windows, MacOS, Linux, Android and iOS. You can play this game using mouse, keyboards and touch screens. It comes with different play styles and released under MIT License. The basic game play comes with adaptability and reaction to stimuli, understanding of the song’s beat, Timing of hits on the object, ability to spin the mouse on spinners, physical stamina and mental fortitude, proper positioning and hand-eye coordination.
Unvanquished is a free and open source first person strategy fast paced shooting game for Linux, Windows and MacOS. In this game you can choose between two teams human soldiers and aliens. The main goal of this game is to destroy your enemy base. This game is a fork of Tremulous and powered by the Daemon engine. It comes with OpenGL version 3 compliant renderer, special effects, texturing techniques, physical mapping, native client VM support, 2D minimaps, real-time beacon system and more.
Sauerbraten or Cube 2 Sauerbraten is a free and open source first person shooter game for Windows, Linux and macOS. It comes with multiplayer & singleplayer game play. This is the successor of the old Cube FPS game. It is released under ZLIB license. It also comes with build-in map editor. This comes with some high quality graphics but you can play little older systems without any problem.
OpenArena is a free and open source first person shooter game for Windows, Linux and MacOS. The game is heavily based on the Quake III. It is Arena style deathmatch game. It comes with Deathmatch, Tournament, Capture the Flag, Overload, Harvester, Elimination, Last Man Standing and Domination game modes. In this game you need to score more frags to win the game. You can use guns, rocket launcher, shotgun, railgun and more in this game. It uses OpenGL 1.x graphics API and released under GPL-2.0+ license.
FreeOrion is a free open source turn based space empire and galactic conquest game for Linux, Windows and MacOS. It is based on classic 4X model and inspired by the Master of Orion games. It is released under the terms of the GNU GPL 2.0 and CC-BY-SA-3.0 license. It comes in single player and multi player modes and you need at least OpenGL 2.1 support to play this game.
Warzone 2100 is a free and open source 3D real time strategy (RTS) game for Windows, macOS, Linux and FreeBSD. It comes with single player campaign, LAN / Internet multiplayer, play versus AI bots and more than 400 different tech tree. It is released under the GPLv2+ license. You need at least 1 GB RAM, OpenGL 2.1+ support and 150MB storage space to run this game.
mki3dgame is a free and open source game for Linux. In this game you need to find objects in 3D stages and also need to escape from flying monsters. The latest version comes with 32 stages and 4 monsters. You can design your own stages and the shapes of monsters or tokens with MKI3D Modeler. It is written in Go and released under GNU General Public License v3.0.
Numpty Physics is a free and open source gravity based crayon drawing puzzle game using Box2D engine. In this game you need to create whatever drawing blocks, ramps, levers, pulleys to get the little red thing to the little yellow thing. It also comes with built-in level editor to build your own levels in this game. It is released under open source GNU General Public License v3.0. It is really fun and interesting game.
KsirK is a free and open source strategic game for Linux. It is a computerized version of strategic board game Risk. In this game you need to attack your neighbor countries with your armies and conquer the world. It is released under GNU General Public License v2.0. You can play with computer or with 6 players and play over a network option also available. You can also create new skins and install new skins in this game.
