OpenXcom

UFO: Enemy Unknown (X-Com: UFO Defense in USA) is a popular strategy videogame made by Mythos / Microprose, where you take control of the X-Com organization to fight off the alien menace invading Earth.

OpenXcom is an open-source reimplementation of the X-Com game, licensed under the GPL and written in C++ / SDL, which was started back in February 2009 by a bored old university student who loves X-Com way too much.

The problem is by now the original game is very old, buggy and dated. So the goal of this project is to bring back the tried and true feel of the original with none of the issues! All the same graphics, sound and gameplay with a brand new codebase written from scratch without disassembling the original executable. This should give it:

- Fixability: Play the game natively without any need for emulators or fancy hacks, with none of the limitations and bugs that plagued the original. No more 80-item-limit, personnel limits, funding overflows, disconnected facilities, broken proximity grenades, floating soldiers, etc.
- Moddability: Tweak the game to your heart’s content. Sure the original was pretty good, but maybe you just think it could be that bit better. A nicer base layout, better laser weapons, maybe challenge yourself with a custom game mode, or just put in all the crazy stuff you’ve always wanted! None of it is hardcoded.
- Flexibility: Port the game to any platform you like, put in your own resources, or use it to make your own far-fetched remakes. The code is fully documented and free to use by anyone in accordance with the GPL.

What is new in this release:

• The game is now fully playable, which means everything should work as intended.
• Many bugfixes and additions.
• This goes along with a new Web site and a few added translations.

What is new in version 0.4.5:

• New features:
• Ufopaedia
• Hungarian translation
• Rightclick mouse scrolling
• Rightclick arrow buttons to min/max values
• Weapons can be toggled on/off during dogfights
• Modular rulesets (specified in options.cfg)
• Soldier reordering
• New options
• Man page / command-line help
• Logging
• Bugfixes:
• Updated translations
• Updated soldier names
• Various string clipping issues
• Various UI issues
• Infinite error message when tanks didn't have ammo
• Tanks getting it on in the storage room (recovered when mission ended)
• Multiple "Tracking Lost" windows per UFO
• Improved auto-equipping to ignore empty weapons and load weapons on the ground
• Brought alien weapons counted towards score
• Civilians didn't count towards score
• Crash when completing a research
• Crash during dogfights
• Wrong mouse input in minimap
• Starting inventory didn't work correctly in mission simulator
• HWP ammo popped up in soldier inventory
• Incorrect armor damage modifiers
• Workaround for big corpse pieces being recovered
• Missing rules for Reaper (crashed terror missions)
• Ammo being reused after loaded
• Civilians counting as saved when mission failed
• Projectiles went through UFO if missed
• Weird avenger spawn point
• Item in elevator crash
• Diagonally walking through trees
• Items flying in the air when flying unit drops items
• Fixed proximity grenade
• Wrong craft speed when patrolling
• Crash when patrolling after UFO lost
• "Go to last known UFO position" button not working
• Incorrect UFO recovery items
• Ammo in weapons wasn't recovered after missions
• Crafts were fully unloaded after missions
• New crafts don't start in base position
• Ammo graphics weren't cleared after unloading weapon
• Minimap doesn't update level when using scroll wheel
• Missing "Not enough equipment to fully re-equip squad" screen
• Incorrect title in Promotions screen
• Various changes to item creation/recovery in Battlescape
• Wrong UFO graphics in interception window
• Wrong craft/UFO altitudes
• "UFO tracking lost" window missing sometimes
• Crash when targeted terror site disappears
• Reapers having incorrect behavior
• Soldiers can turn without TUs
• Walking through knocked down walls takes 4 TUs
• Primed state of a grenade is not saved in the savegame
• Firing and throwing accuracy does not decrease on injury
• Diagonal line of sight through windows
• Minimap not showing visible aliens on invisible tiles
• Visible units not stored in save
• Beam weapons not dealing any damage to UFOs
• Rewritten dogfight radar animation
• Dogfight UFO hit animation
• Dogfight UFO crash animation
• Dogfight projectiles animation
• Projectiles could hit UFO even if it was out of their range
• Added craft damage indication
• Added translated terrain names to New Battle
• Sound and graphics of flying suit
• Small pathfinding issue
• Segfault when mindprobing empty space
• Untranslated Geoscape sidebar
• Implemented faster unit walk speed off screen
• Items visible on minimap on undiscovered tiles
• Units walking on top of each other
• Incorrect behavior with ground items in inventory
• Options screen and resolution selection
• Craft has wrong position when transferred
• Craft doesn't reequip when transferred
• Game returns to the actual game after saving (instead of previous menu)
• Drawing issue in medikit and scanner view
• Improved explosion animation scaling with power
• Explosion sound
• Added Elerium-115 to battlescape
• Vertical pathfinding
• Cancel firing mode when pressing move up/down
• Flying up/down graphics
• Show damage percent of craft on its state-panel
• Buttons not pressing with right-clicks
• Bugs in soldier name generation
• Added geoscape position to saves
• Added "We can now produce" Geoscape window
• Walk/move sounds
• Proper ammo accounting after battles
• Added "loading/saving..." messages to savegame screens
• Being able to input text in resolution
• Non-ASCII character input
• Non-ASCII savegame names
• Crash when trying to rearm crafts with empty weapon slots
• Weapons glitching when dropped by panicked soldiers
• UFO trying to escape after being destroyed
• Freeze in wordwrapping
• Big text automatically switches to small if string doesn't fit
• Battlescape crash when items were dropped
• Unlimited ammo weapons being incorrectly recovered
• Mouse being restricted to 320x200 area in some systems
• Not being able to overwrite saves with non-ASCII names
• Save list not synchronizing with text input
• Weapon unload not clearing text
• Basescape not resetting time to 5 Secs
• Random seed missing in saves
• Crash when large units tried to move outside the map
• Wrong reaper sound

What is new in version 0.3:

• Items
• Purchasing
• Selling
• Transferring
• Ufopaedia
• Options
• Platform-specific Folders
• Battlescape:
• Item equipping, firing, throwing
• Environment: fire, smoke, explosions, damage, kills
• Unit stats
• AI Phase 1 (patrol, aggro)