OpenXcom r&d mods

• OOpenXcom Extended Coop Modby xcomcoopteamOpenXcom Co-op Mod (OXCE) adds cooperative multiplayer to UFO: Enemy Unknown (UFO Defense) and X-COM: Terror from the Deep. Play the main campaign or custom battles with a friend over TCP/IP via the in-game Co-op menu.613 downloadsupdated 3 mo ago
• MMars-comby NordX-com on Mars. After the TFTD, before the Interceptor and Apocalypse. From the author of TWoTS and X-Chronicles. OXCE only.581 downloadsupdated 1 mo ago
• TTop Gunby HobbesOXCE. Adds pilots to XCom, required to pilot all craft.566 downloadsupdated 17 mo ago
• AAlloy Tanksby baconiaAdds Alloy Tanks and mfg. upgrades for vanilla Tanks to Alloy Armour.527 downloadsupdated 8 y ago
• AAlloys and Elerium on top [minimod]by MarkusRamikinAlien Alloys and Elerium will be listed first, for convenience. Also works in TFDT, for Aqua Plastics and Zrbite.434 downloadsupdated 6 y ago
• RRetaliator-Xby DBarizoAn "Expanded" version of the Retaliator for OXCE370 downloadsupdated 2 y ago
• [[TFTD] [CheatSuite] Tech-tree Rework and Lore Expby starslab[CheatSuite] Makes changes to the research tree, adding Plastics-integrated Coelecanths and Crafts to the game.368 downloadsupdated 5 y ago
• RRetaliatorby ShadowX86An intermediate fighter craft between the Interceptor and Firestorm.356 downloadsupdated 3 y ago
• TTerran Plasma Weaponsby ShadowX86Adds a whole line of Terran plasma weapons. Alien plasma is unusable by humans.290 downloadsupdated 3 y ago
• XX-COM Terror from the Deep Relaxed and Refreshedby LordKane773Changes Terror from the Deep to be less artifically hard and more like UFO Defense in a few ways.286 downloadsupdated 4 mo ago
• PProject Xenophobia (XCF)by idkincAdds large amounts of content to the X-com Files including but not limited to multiple new weapon trees multiple new missions multiple new balistic weapons and new mechanics that are better explained ingame261 downloadsupdated 15 mo ago
• DDifficult Cydonia Unlockby baconiaIncreases the research difficulty to unlock the final mission246 downloadsupdated 8 y ago
• FFatRed's Elerium Recyclingby fatredbird2Adds an option to break down alien ammo for elerium-115.202 downloadsupdated 15 mo ago
• MMew's Harmony Tweaksby MewtasticA handful of tweaks to balance, add more content, and increase the quality of life in the Harmony Megamod.184 downloadsupdated 4 mo ago
• CCrewsby MesonchanThis mod adds variety to alien crews, featuring more unique terror units, elite warriors and weapon types, plus introduces number of other updates for better balance and more strategic depth151 downloadsupdated 15 mo ago
• FFatRed's Research Rebalanceby fatredbird2Reworks the research tree to make certain techs less pointless.137 downloadsupdated 13 mo ago
• AAir Warfareby DBarizoBecause air superiority wins wars. 3 new crafts, updated classics, new and improved air to air weapons and pilots.135 downloadsupdated 6 mo ago
• XXCHR Less Research Submodby Varajo411This mod reduce most research cost down 50% for Xcom Chronicles128 downloadsupdated 2 y ago
• DDifficult Hovertanksby baconiaChallenges commanders by making Hovertanks more difficult to manufacture.121 downloadsupdated 8 y ago
• XXcom Scavengersby Jot_666999No alien devices can be produced, Air2Air missiles are expensive, Alien soldier stats are better (Xcom too), psionics is a game of Ethereals, research tree is longer, some researches are now very useful, a lot of items with new prices.104 downloadsupdated 3 y ago
• XXCultby Kalamona666huAn urban fantasy themed total conversion of the UFO game - lead a mystic cult on their path of freeing a psionic entity.79 downloadsupdated 6 mo ago
• PPellaeon's Wild Xcomby ThePellaeonI made this small mod to "bring the hurt" so to speak to the aliens instead of the alien's killing your poor soldier's brutally!75 downloadsupdated 6 mo ago
• PPellaeon's Wild TFTDby ThePellaeonI made this small mod to "bring the hurt" so to speak to the fishy aliens instead of the alien's killing your poor aquanaut's brutally!65 downloadsupdated 6 mo ago
• XXcom Scavengers 2.0 and Scavengers Hardcoreby Jot_666999Scavengers2.0: No Alien goods can be produced, but a lot of Alien goods is required for building new toys or facilities. Scavengers Hardcore: Psi is ONLY for Aliens, and no Alien-made goods can be sold for profit.57 downloadsupdated 2 y ago

72 r&d mods, most downloaded first. Each one has its own page here with what it needs to run and where its author publishes it; the files themselves stay with the author and are never re-hosted on this site.