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Top 23 source-engine Open-Source Projects
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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source-engine
Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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They already upgraded the game a couple of times since release. A big one was the Linux port which also saw many changes to the Windows version.
Regressions do happen which is why they opened a bug tracker at the time, which is still in use: https://github.com/ValveSoftware/Source-1-Games/issues
If you have any HL2 issues, now is probably a good time to get them fixed before the developers responsible for the update get bored and move to another project.
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advancedfx
Half-Life Advanced Effects (HLAE) is a tool to enrich Source (mainly CS:GO) engine based movie making.
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Stream
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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Plumber
A Blender addon for importing Source 1 engine maps, models, materials and textures. This addon makes it possible to import full CS:GO, TF2, CS:S or other Source 1 game maps into Blender. (by lasa01)
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SourceDemoRender
Multithreaded, hardware accelerated solution to create high quality movies for the Source engine.
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BlenderSourceTools
The Blender Source Tools add Source engine support to Blender, the free 3D modelling suite.
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tf2-patches-old
Team Fortress 2, but with a lot of fixes, QoL improvements and performance optimizations!
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Portal-Base
Port of Portal 1 2007 leaked source code to Source SDK 2013. Also includes fixes for Half-Life 2 maps and gameplay.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
source-engine discussion
source-engine related posts
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Brody Foxx is now official in roblox TF2, how do you feel about this?
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Why is Hammer notorious for being a pain in the ass?
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setting up a surf server offline?
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Modified source engine (2017) developed by valve and leaked in 2020
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TF2 does not launch properly. Game opens, switches resolution to 720x576, then shows the loading splash screen and dies. What's going on?
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Server requirements to host a 100 player server?
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I love random crits
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A note from our sponsor - InfluxDB
www.influxdata.com | 18 Jul 2025
Index
What are some of the best open-source source-engine projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Osiris | 3,517 |
| 2 | source-engine | 1,809 |
| 3 | PBCharacterMovement | 1,371 |
| 4 | sourcemod | 1,057 |
| 5 | Source-1-Games | 723 |
| 6 | mastercomfig | 675 |
| 7 | advancedfx | 574 |
| 8 | game | 546 |
| 9 | Plumber | 434 |
| 10 | metamod-source | 431 |
| 11 | hl2sdk | 382 |
| 12 | SourceBans++ | 347 |
| 13 | SourceDemoRender | 314 |
| 14 | BEE2.4 | 307 |
| 15 | BlenderSourceTools | 249 |
| 16 | tf2-patches-old | 236 |
| 17 | CompilePal | 234 |
| 18 | SourceOps | 155 |
| 19 | rcon | 149 |
| 20 | BEE2-items | 135 |
| 21 | source-pbr | 131 |
| 22 | halflife2chaos | 122 |
| 23 | Portal-Base | 119 |
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InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
www.influxdata.com