I have already bought several of point and click adventure games using Adventure Game Studio engine. Current GOG.com versions are prepared to work on
Ubuntu 14.04 and Mint 17. I am using more recent Ubuntu 15.04, so the above-mentioned game engine needs to compiled beforehand.
Battle for Wesnoth is a game worth playing not just in light of the fact that it is Open Source, as it is the most outstanding turn based tactical strategy game.
Angband is an adventure simulation game that takes place in a deep dungeons, with the main goal of defeating Morgoth, the Lord of Darkness.
OpenTTD is an open-source remake of the popular Transport Tycoon Deluxe game from Mircoprose.
If you remember the DOS version of Scorched Earth, then the 3D visual effects in the latest Scorched3D game will blow you away.
FreeCol is a project being undertaken to create an open source version of the 1994 Microprose Game Colonization. The first version was a clone of the old game, but work is being done to provide enhancements to make game-play more interesting and complex.
Freeciv is an open source strategy game that has more than a strong resemblance to the Civilization series that have been available for over the past 20 years. The point of the game is to found and nurture a civilization, increasing its size and scope, developing technology and culture and growing its economy and military strength.
Unknown Horizons is a free and open source real time online game under active development that simulates the economic development of a small settlement into a large and prosperous colony. The player will be required to employ resource management skills, political acumen, economic expertise and diplomacy to prosper in game play.
Gamers who enjoy putting their strategic abilities into play won’t be disappointed with the recent release of Widelands – free and open source game which is under active development with more enjoyable graphics, sound effects and maps being incorporated into the game all the time.