Some of The Best Truly Free and Open Source Games on The Internet

The internet is filled with rubbish games that claim to be free but are in fact ad ware, propaganda or just plain boring. Rather try these totally free, totally ad free and totally fun games. These games contain something different that make them truly unique.


This super addictive open source game blends elements of team based FPS (first person shooter) and RTS (real time strategy).

  • Choose to be an alien or human player
  • Build up to 16 different structures; each with it’s own functions
  • Scale walls as an alien waiting for an unsuspecting human to pass by
  • Realistic physics
  • Buy weapons and armor as a human
  • Several alien classes with unique abilities

Frets on fire

Fret on Fire is a game of musical skill. Play guitar on the keyboard while trying to be as accurate as possible. Many people believe this to be one of the most fun games ever made.

  • Distinctive inverted keyboard gameplay style
  • Supports guitar controllers or joysticks
  • Hundreds of songs

BZ Flag

When it comes to multiplayer games this must be one of my favorites, I don’t even know why but it’s just so much fun! And I’m not the only one who thinks so. Its one of the most popular open source games ever.

BZ Flag is a multiplayer tank battle game with no special features just a winning formula for the perfect package of distilled fun.

Danger from the Deep

DftD is a graphically rich and engaging World War II submarine simulator.

I chose this game because it’s turning out to be the best free submarine simulator and everybody loves being the silent hunter…

This game is still in the ALPHA stage of development but playable and recommended none the less.

If you don’t believe me have a look at the screenshots.

True Combat: Elite

I love this tactical-team shooter because in my opinion it’s one of the few games to add a variety of options and weapons without robbing the game of any of its fun or pace.

TC:E is a feature rich total conversion for Wolfenstein Enemy Territory and for me it’s even more fun than Enemy Territory itself.

You may be thinking: “just another terrorist counter terrorism shooter” but don’t be fooled TC:E is engaging and not just a brute force show of skill, many other factors play a roll. In essence TC:E is just a more realistic experience than the other games of this kind.

  • Letterbox and widescreen modes
  • Cross Platform Support (Win, OS X, Linux)
  • Realistic weapon behavior simulation
  • Iron sight aiming system, no crosshair
  • Sophisticated ballistic simulation including multiple-layer object penetration
  • Balanced, team specific set of real-world weapons (Grenades, Pistols, SMG’s, Assault-, Shotgun- and Sniper-Rifles)
  • Lag compensation, client-side bullet prediction


What I looked at in this article is games with that little something special that transforms a game form just another game to the game I can’t seem to stop playing.

Many other free games are indeed very good but these games are something different and to me they seem to stand out.

Stay tuned for more games.

These are my favorite free games, you are welcome to comment and share yours too.

Liked it
  1. Ryan™
    Posted December 7, 2007 at 7:09 pm

    There’s Gunz online, MapleStory (it gets boring after a while though), Runescape, Eudemons online, and Silk Road.

    Some games that you can get money from is/are Second Life and…er…I forget the other one.

    I’ve never played Gaia Online but I’ve seen a few things for it (cheat engines, etc.) so I think it’s pretty popular.

  2. AstralSin
    Posted December 7, 2007 at 7:45 pm

    You forgot Alien Arena, Warsow, Nexuiz, World of Padman, loads of others, but decent stuff here

  3. L. Marksman
    Posted December 8, 2007 at 2:21 am

    True, those seem very good.

    I’m planning another article with more so in the meantime I’ll research and play some of your suggestions.

    Thanks for commenting.

  4. kennypu
    Posted December 8, 2007 at 3:29 am

    2 ryan:
    those won’t count because they are not open-source.but yes, they are good games, especially Gunz XD.

  5. great list
    Posted December 8, 2007 at 5:07 pm

    I think wesnoth is also multiplayer, but im not sure. I only played the single player campains and they were very fun. Great list!!

  6. wookie
    Posted December 11, 2007 at 9:57 am

    Tremulous and danger from the deep look awesome! I’ve never heard of these games before…Thanks.

    Alien arena is kind of fun but I can never find servers with more than 4 people playing at one time.

    True combat elite is REALLY fun. I’ve spent a lot of hours playing that.

  7. JD
    Posted December 12, 2007 at 12:33 am

    Thanks, grabbing the submarine simulator now.

    I don’t know how “truly unique” that DDR ripoff is…

  8. L. Marksman
    Posted December 12, 2007 at 6:35 am

    I don’t know about the FOF being a DDR (Dance Dance Revolution) rip-off.

    Yes it uses the same basic idea but I think of it more as another title in a genre rather than a rip-off.

    If everyone criticized games using the same genre we would probably still be playing Spasim(1974) because all other FPS games are rip-offs.

    It contains features making it unique like the ability to play guitar hero style on your keyboard.

  9. N.Beringer
    Posted December 12, 2007 at 12:19 pm

    Thanks for posting this article. Definitely some guilt free fun to be had playing these games with everyone.

  10. fnaz
    Posted December 12, 2007 at 1:10 pm

    I’d bet that DDR ripoff meant StepMania, not FOF

  11. gna
    Posted December 12, 2007 at 1:12 pm

    Neither TrueCombat: Elite or Enemy Territory are open-source…

  12. L. Marksman
    Posted December 12, 2007 at 5:07 pm

    Yes that is true, in retrospect my title should have read: Some of the Best Truly Free OR Open Source Games on the Internet.

    I don’t care that a game isn’t open source as long as there isn’t any strings attached.

  13. jace goods
    Posted December 12, 2007 at 6:05 pm

    wots #open source’ mean guys? please?

  14. JASON
    Posted December 12, 2007 at 6:11 pm

    I just tried to play that ‘Frets of fire’ but when I click on your link (the title) all I get is a page that opens with ‘About Frets Of Fire’, no download or play option ?? Can anyone help pls? Thks

  15. L. Marksman
    Posted December 13, 2007 at 6:26 am for all the download options.

  16. L. Marksman
    Posted December 13, 2007 at 6:29 am

    An open source program is a free program of which the source code(the files used to make the program) is freely available for anyone to improve or use in other free projects.

  17. L.Marksman
    Posted December 14, 2007 at 9:11 am

    At last! My second list of games is finished, find it here:

  18. lordoftheives
    Posted December 15, 2007 at 5:51 pm

    wesnoth is multi player, and another great single player game is cave story

  19. lordoftheives
    Posted December 15, 2007 at 7:37 pm

    btanks is really confusing. I dont know who’s on my team, or much of anything for that matter.

  20. ReignonYourParade
    Posted December 16, 2007 at 12:01 pm

    I recommend dwarf fortress, despite the fact that it is still an alpha.

  21. snoop dog
    Posted December 17, 2007 at 3:25 pm

    Another great game (that I am currently addicted to) is Soldier Front, found on… You buy your weapons with money they provide you and then fight real people from all over the world (I even played someone from Israel!). The only problem, as I have already said, is that it is unbelievably addicting (but that comes with great games) and there are hackers :(

  22. Deceth
    Posted December 18, 2007 at 7:32 pm

    Game that I currently play thats free is BattleCity Classic! You build, defend and attack cities while riding a tank ;)

  23. L. Marksman
    Posted December 19, 2007 at 6:40 am

    The second article(Some of the Best Truly Free or Open Source Games on the Internet 2) has moved here:

    Reason for move: More visible and reputable site than Gameolosophy.


  24. Saum
    Posted December 19, 2007 at 12:57 pm

    There is also Warrock.

  25. kamil
    Posted December 19, 2007 at 4:35 pm

    where is America’s Army in this list? it should be #1…

  26. Waffleeeee!
    Posted December 19, 2007 at 9:35 pm

    Nice list, I checked out some of those games. If you make another, you might want to add Flyff. It’s not bad, and totally free. Except for paying for extras, if you count that. You get the full game free, but some ’sparkle’ you can buy.

  27. Mataor
    Posted December 21, 2007 at 1:27 am

    Is there a plane combat simulator, like the long lost Crimson Skies? Oh how I wish some kind soul makes an open Source from that game, or at least sometning similar.

  28. Dilbo
    Posted December 21, 2007 at 11:28 am

    I found my split near the end. Where is the other cabin? Please your lord.

  29. Unknown glory
    Posted December 22, 2007 at 10:57 am

    What about americas army huh? u left that great game out…

  30. L. Marksman
    Posted December 22, 2007 at 11:44 am

    No matter how you look at it; AA is and always was propaganda (and consequently not really free). It is fully government funded and has the sole purpose of promoting the US army. But I agree it is a high budget quality game.

    Many people seem to ask for another one of these lists despite the fact that I already made one (first comment #18 and then comment #25) but the second list (even better than this one in my opinion) hardly gets traffic.

    Here is the link again:
    Remember to stumble or digg if you like it

  31. Cameron Eittreim
    Posted December 24, 2007 at 1:40 pm

    Nice informative article dude, I’ve played a number of open source games and most of them are actually pretty good.

  32. Jared Stenzel
    Posted December 26, 2007 at 12:20 am

    Great list! I think the only one of those games I’ve played is the tank one, and then of course the guitar game I’ve played on an xbox. I look forward to a second list. I don’t really know of any truly free games, but you’ve got a lot of suggestions here.

  33. jackiee
    Posted December 26, 2007 at 12:40 am

    it’s good

  34. Steven West
    Posted December 26, 2007 at 3:19 pm

    Nice variety of free games. I have bookmarked various sites for free computer games.

  35. Efe Ozalp
    Posted December 26, 2007 at 3:54 pm

    hi! ı just downloaded Frets on Fire but when i entered the game and select to play the game, it gives me some errors and quits the program.Do someone have any idea what should i do about it or do anybody else have theese kind of problem?
    thank you!!

  36. Tommy-TBone
    Posted December 28, 2007 at 5:27 pm

    Good list, I’m a big Tremulous fan. Another good free game engine is Marathon Aleph One –

    There’s loads of scenarios for it.

  37. jonny
    Posted January 3, 2008 at 2:53 am

    you forgot

  38. Josh W.
    Posted January 3, 2008 at 8:56 am

    from comment #1: “Some games that you can get money from is/are Second Life and…er…I forget the other one.”

    I believe the other game is called Project Entropia

  39. CommandLine-Mind
    Posted January 5, 2008 at 11:34 am

    Over 150 Free Open Source Games.

  40. martinact420
    Posted January 10, 2008 at 11:12 pm

    yEAH ALL looks well, check out this gaming site

  41. Bradley
    Posted February 10, 2008 at 5:08 pm

    Well I WAS going to stumble this but… seeing as the title says free AND open-source… no rating :P
    NAAAH JUST KIDDING! Of course im going to give this thumbs up ;)

  42. Silky
    Posted April 13, 2008 at 10:39 am

    Don’t forget Return to Castle Wolfenstein: Emeny Territory. Wonderful multiplayer-based first person shooter.

  43. davo
    Posted May 13, 2008 at 6:32 pm

    Not open source but a great free game is Trackmania Nations Forever… loads of multiplayer fun

  44. woot
    Posted January 28, 2009 at 5:29 pm

    I farted.

  45. bruno
    Posted February 26, 2009 at 9:12 am

    rsrsrsrs só foto nao adianta rsrsrs

  46. Chuck Norris
    Posted March 23, 2009 at 8:52 pm

    Thank you for posting this information. For people that don’t spend alot of time on the internet playing these types of games finding good ones is difficult. I have been looking for truly free online games and haven’t found many.
    I haven’t vetted the games that you have listed but I would be interested if anyone can point me in the direction of games that don’t require the purchase of any points to gain an advantage. I don’t recall having to spend money to beat my friends or strangers in games of skill.
    Good games that are massive, and provide a level playing field. Please post information about these games so that I can check back in a month and see where I should look.

  47. Chris
    Posted April 7, 2009 at 12:09 pm

    Aces High 2 – Great online and offline WW2 flight combat simulator. The newest version 2.13 removed LAN support but the previous version 2.12 has it. You can set up an 8 player LAN game in that version if you want. It’s mainly for online play but offline is playable as well.

  48. Eric
    Posted June 26, 2010 at 12:47 pm

    Try Star Control 2, it’s been open sourced and a sci fi classic.

  49. ftard
    Posted March 13, 2013 at 4:31 am

    youuuuuuu bitchz
    i hve to pay 20 fing buks 4 each faggot

  50. ftard
    Posted March 13, 2013 at 4:32 am

    youuuuuuu bieetchz
    i hve to pay 20 fing buks 4 each fagghot

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