- Action
- Free To Play
Game
Alien Swarm: Reactive Drop
Alien Swarm: Reactive Drop is a FREE and open source cooperative top down shooter. The player plays with other marines against hordes of aliens, in order to complete different objectives. In the game, there are 4 different classes to play, each one consisting of two characters with different statistics including some class restricted weapons. During gameplay, the player will earn experience, that is used to unlock new weapons and items to use in combat. The game combines elements from survival games like Shadow Grounds and Left for Dead.
Co-operative top-down shooter game available for free. An epic bug hunt featuring a unique blend of co-op play and squad-level tactics.
About Alien Swarm: Reactive Drop
- Released
- April 2017
- Developer
- Reactive Drop Team
- Engine
- Source
- Platforms
- PC (Microsoft Windows)
Where to get it
Release, studio and platform data from IGDB. Store links go to the sellers, not to us. We do not sell games and we do not host files.
Browse everything
Sorted, filterable and paged. Every link goes to the author’s own download.
From the developers
Official announcements, newest first. Posted on Steam.
- Community AnnouncementsAS:RD Update - April 20, 2026 "Going Up"It's time once again for Alien Swarm: Reactive Drop's birthday. We're having a smaller one this year since a lot of our core contributors have been busy with other projects, but we've still got a lot of improvements to share and the usual week of double experience. AMD GPU Driver Crash The game now automatically disables high quality realtime shadows on AMD graphics cards that are affected by t...
- Community AnnouncementsComing Soon: Steam PvP Fest 2026Every year, Valentines day is a time to be with friends and loved ones and reflect on your friendship and love. Well, not this year! In 2026, it's all about having simulated gun fights with friends and loved ones. Welcome to Steam PvP Fest 2026. There's nothing more romantic than a space marine deathmatch. You Deserve a Medal {STEAM_CLAN_IMAGE}/27357479/09d2dc6f1fa689d30b9c341e6b19c07f7856cae1....
- Community AnnouncementsAS:RD Update - November 1, 2025 "Cone of Fire"Highlights Added a SynTek Residential themed main menu background. The camera feeds that display behind briefing have less static and are less distracting. Many guns are now more accurate while crouching. Weapons Weapon recoil has been changed on several guns. A coding error was previously causing "flattened" recoil to work differently when aiming north or south versus east or west. 22A3-1 Assa...
- Community AnnouncementsAlien Swarm: Reactive Drop Hotfix - September 20, 2025A minor update has been released for Alien Swarm: Reactive Drop. Fixed a client crash in the Traitors game mode. Added a note in the Swarmopedia about the IAF Medical SMG's increased accuracy while crouching. Added a description for EC-02 Stun Grenades in the Swarmopedia.
- Community AnnouncementsAlien Swarm: Reactive Drop Hotfix - September 3, 2025Fixed black bars appearing on the sides of the screen for screen resolutions with an aspect ratio wider than 16:9.Fixed traitor players showing as having 99 player kills in the scoreboard.Fixed buzzers bleeding red blood on the client.
- Community AnnouncementsAS:RD Update - September 1, 2025 "Electrical Hum"Special thanks to Dmitriy, Mithrand, jhheight, 法克尤尔马泽尔, and Grimowy for the majority of the changes in this update. New Game Mode: "Traitors!" Commander, As the human shield, the IAF has achieved great victories in countless battles against the swarm, but also suffered tremendous losses. We sincerely thank you and your squad members for your outstanding contributions in defending against the al...
- Mods indexed
- 1.9k
- Versions
- 0
- Newest tracked
- none yet
- Most disruptive update
- No breakage data for this game
Most downloaded
Measured from the source's own counts, summed across every release.
- Dead CityCampaign with 4 levels/missions Misson Briefing: Syntek have a serious problem they have an important director stuck in the city. He is held up in a Syntek building, completely over run by the swarm. You have to walk him out of there.111.5k downloads
- City 17107.8k downloads
- First PersonBlast aliens from first person view. Subscribe to the challenge whenever you want. You don't need to unsubscribe or disable the addon when done playing.85.8k downloads
- L4D2: Dark CarnivalMission: Highway Previous events - We escaped from the mall in a Jimmy Gibbs car. Now we have to go through the highway to motel Whispering Oaks. Go through the swamp and get to the amusement park. In the motel you have to fill the generator with five canisters of fuel, be careful, random shootin...62.1k downloads
- Custom HUDThis Custom HUD shows all Players on the HUD. Tested on all 16:9 Resolutions. While you're at it, also get this: Lobby 8 players list full view by byblo 这个自定义HUD显示了HUD上的所有玩家。在所有16:9分辨率测试。当你在它，也让这8位球员的名单：大厅全景的毕布勒 （翻译）56.3k downloads
- A Halo weapon packA weapon pack containing various weapons from the Halo series. Includes models, textures, sounds, and UI icons. This includes one skin for each weapon. This does not include all of my Halo skins. Unfortunately, the Assault Rifle and Combat Rifle share a fire sound. To use the .50-cal MG or Mining...44.7k downloads
- Lobby 8 players list full viewAt the lobby screen, allow to see all first 8 players from the list without having to use the scroll bar. Also compatible with 4:3 screens. 在大厅的屏幕，可以看到前8名从列表中无需使用滚动条。 同时兼容4:3的屏幕。44.5k downloads
- ODST Swarm Marinesrevision 1.0 ------------ EN: *Port models from Halo. *New music theme from Halo. revision 2.0 ------------ EN: *New portraits. *Fix bones on models. *Fix animations players. revision 3.0 ------------ EN: *New arrows and smiles. *Fix removed the pilot's picture. *Fix vertex on compile. *Release f...39.2k downloads
- Blue Archive Player Model VOL.1Replaces the Marine's model and voice with a student from the Blue Archive. Game Development Club Supplemental Lessons Club ■ An autoexec_(WorkshopID).cfg file is included by default, which adds rd_marine_gear_hide_backpack 0 to prevent the character-invisibility issue. ■ If you want to hide only...37.1k downloads
- Black MesaA series of maps by the cult game Black Mesa, the campaign has four missions so far. maps that I have already done, made three-dimensional, taking into account the rotation of the camera, so go to the settings and adjust the buttons for rotation. MY WORKSHOP36.3k downloads
- Adanaxis CampaignAdanaxis campaign. 6 quality maps + 1 bonus map. Latest news: 20.09.2019 Dark path has been updated with new nice crystals created by ZETA. Big thx to him:) 04.09.2019 Dark path rework is ready. Perhaps soon there will be additional stuff but for now we introduce yet another nice update. So map i...36.1k downloads
- Standlone 40k Weaponsrevision 1.0 ------------ EN: *Port models from Warhammer 40k. *Fix UV maps and port original textures. revision 2.0 ------------ EN: *Fix vertex on models. *Fix bones in models. *Replace model ammo. P.S: original model there: ( 40ksource.com ) i port model, so welcome too :)34.3k downloads
- Doom Swarm Marinesrevision 1.0 ------------ EN: *Port models from Doom. *New music theme from Doom. *New portraits. *Fix removed the pilot's picture. *Replace smiles and arrows from my ODST mod on Alien Swarm. revision 2.0 ------------ EN: *New cacodemon. revision 3.0 ------------ EN: *Fix cacodemon hitbox, yes th...32.9k downloads
- Space Swarm Marinesrevision 8.2 ------------ EN: *Update now without particles. *Full support RD and new sceletal meshes. revision 8.1 ------------ EN: *Resize bags. *Fix animations. revision 8.0 ------------ EN: *Port original models from Dawn Of War 2. *Custom colors *New music theme. *Update old portraits and ne...30.9k downloads
- Blue Archive Player Model VOL.4Replaces the Marine's model and voice with a student from the Blue Archive. Semina C&C ■ An autoexec_(WorkshopID).cfg file is included by default, which adds rd_marine_gear_hide_backpack 0 to prevent the character-invisibility issue. ■ If you want to hide only the secondary weapons model and see...29.3k downloads
- Blue Archive Player Model VOL.2Replaces the Marine's model and voice with a student from the Blue Archive. RABBIT Squad Problem Solver 68 ■ An autoexec_(WorkshopID).cfg file is included by default, which adds rd_marine_gear_hide_backpack 0 to prevent the character-invisibility issue. ■ If you want to hide only the secondary we...29.0k downloads
- Blue Archive Player Model VOL.3Replaces the Marine's model and voice with a student from the Blue Archive. Foreclosure Task Force Ninjutsu Research Department ■ An autoexec_(WorkshopID).cfg file is included by default, which adds rd_marine_gear_hide_backpack 0 to prevent the character-invisibility issue. ■ If you want to hide...26.0k downloads
- M739 AutogunA weapon skin for the Autogun, the M739 SAW from the Halo series. Includes model, texture, sounds, and UI icon.26.0k downloads
- Star Wars: Republic Commando Player ModelsThis mod replaces the default player models with Delta squad from Star Wars: Republic Commando, allowing you to play as Boss, Fixer, Sev and Scorch. No sounds are included with this mod. Credit goes to LucasArts for creating the original Star Wars: Republic Commando assets; all I did was rig/port...25.1k downloads
- Updated sChinese Translation基于 的简体中文翻译，添加了新版本内容的翻译，并修改了几个存在很久的错别字。24.4k downloads
- 无限弹药 / UNLIMIT AMMO无限弹药 unlimit ammo21.9k downloads
- Etilka 50calA weapon skin for the 50cal HMG, the modified M247H Heavy Machine Gun "Etilka" from the Halo series. Includes model, texture, sounds, and UI icon.21.7k downloads
- Biogen Corporation campaignBiogen Corporation is a 3 mission campaign by Uradzimiru. RD team have the permission to include this campaign into RD but this campaign needs some polishing and for now is available through workshop. Mission 2 is a puzzle mission where you need to find guns and a way to the Biogen labs. Mission...20.2k downloads
- Blue Archive Player Model VOL.5Replaces the Marine's model and voice with a student from the Blue Archive. - Tea Party - Remedial Knight - Justice Task Force ■ An autoexec_(WorkshopID).cfg file is included by default, which adds rd_marine_gear_hide_backpack 0 to prevent the character-invisibility issue. ■ If you want to hide o...19.2k downloads
Browse all 1.9k Alien Swarm: Reactive Drop mods Sortable by downloads, rating and date.
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Why Alien Swarm: Reactive Drop mods break
A mod is compiled against one version of a game. When the game updates, anything that reached into the parts that moved stops working, and it usually stops working silently rather than with a message that explains itself.
That is what the table above counts. It is not a guess: each row is a mod the community has reported as broken by that specific release. The number is a fair measure of how disruptive an update was, and it is the reason people delay updating a game they have modded heavily.
Common questions
Does IndexGG host Alien Swarm: Reactive Drop mods?
No, and it never will. Every download link points at the author's own page on Nexus, GitHub, CurseForge or wherever they published it. We index the ecosystem; the files stay with the people who made them.
Where does the compatibility data come from?
From the communities that maintain it in the open, not from guesswork. Each claim carries how it is known, so a reported breakage is never presented as though the author said it.
Why is a mod listed as broken when it works for me?
Compatibility depends on your exact game version and the rest of your load order. A mod marked as broken in one release may work fine on an older one, which is exactly why the version is recorded next to the claim rather than a bare yes or no.