Alternatives and similar repositories for level-design:

Users that are interested in level-design are comparing it to the libraries listed below

• powerlord / tf2-data
  Netprops, Datamaps, and sounds from TF2.
  ☆23Updated 6 years ago
• crashfort / HammerPatch
  Modification of Source Valve Hammer Editor to fix some issues. Fixes brush vertex precision loss.
  ☆60Updated 7 years ago
• PazerOP / CastingEssentials
  A Team Fortress 2 client plugin that enhances the experience of both casters and viewers.
  ☆30Updated 5 years ago
• momentum-mod / docs
  Momentum Mod Documentation: Guides, Entities, Console Commands and Variables
  ☆12Updated last month
• momentum-mod / website
  Momentum Mod's main website.
  ☆59Updated this week
• ficool2 / PhysSwapper
  Standalone Source plugin to switch physics engines at runtime
  ☆29Updated last year
• tuxxi / propper-2013
  Propper for Source SDK 2013
  ☆38Updated 8 years ago
• SourceCE / Source-SP
  [Dead] The 2013 community edition of the Source SDK
  ☆16Updated 8 years ago
• redsunservers / VSH-Rewrite
  Popular Versus Saxton Hale gamemode remade from scratch
  ☆34Updated last week
• Metapyziks / VMFInstanceInserter
  Inserts instances into a VMF. I am the best at names.
  ☆40Updated 5 years ago
• wouterpleizier / source-sdk-2013
  The 2013 edition of the Source SDK
  ☆16Updated 8 years ago
• momentum-mod / lumper
  BSP lump editor and review tool
  ☆33Updated this week
• zm-reborn / zmr-game
  Zombie Master, an RTS/FPS game on the Source 2013 engine.
  ☆43Updated last month
• FIREFIGHT-RELOADED / FIREFIGHT-RELOADED-src-sdk-2013
  Bitl's SMOD-like HL2 mod, FIREFIGHT RELOADED, built with Valve's Source SDK 2013 Base.
  ☆23Updated this week
• kolessios / insource-legacy
  Modified version of Source Engine "Alien Swarm". Not suitable for production use.
  ☆15Updated 4 years ago
• ficool2 / bsp_rename
  Source 1 BSP renamer
  ☆17Updated last year
• SourceSDK2013Ports / NextBot
  A Git-based fork of Valve's NextBot code.
  ☆36Updated 5 years ago
• dalegaard / CastingEssentials
  A Team Fortress 2 client plugin that enhances the experience of both casters and viewers.
  ☆12Updated 11 months ago
• ficool2 / HammerPlusPlus-Issue-Tracker
  Bug and feature request tracker for Hammer++
  ☆35Updated 2 years ago
• ldesgoui / tf2-comp-fixes
  Various TF2 tweaks catered towards competitive play
  ☆49Updated last week
• kolessios / sourcebots
  Artificial intelligence to create Bots in Source Engine.
  ☆22Updated 4 years ago
• roninopf / tf2basehud
  Team Fortress 2's original/basic HUD. Use this to customize your own.
  ☆26Updated 7 years ago
• Sergey-KoRJiK / SourceEngineBSPditor
  Source Engine BSP Editor
  ☆17Updated 2 years ago
• asherkin / TF2Items
  Items with custom attributes.
  ☆35Updated last week
• 95Navigator / insolence-2013
  Repository for the Source Engine modification Insolence
  ☆13Updated 4 years ago
• Petercov / Source-PlusPlus
  ☆28Updated 4 years ago
• DrChat / Gmod-vphysics
  Replacement vphysics module for the Source engine (originally meant for Garry's Mod)
  ☆93Updated 8 years ago
• CoaXioN-Games / coplay
  An implementation to use Steam Networking Sockets in the Source SDK
  ☆31Updated 2 months ago
• saul / cvar-unhide
  Plugin to reveal all console variables/commands that are marked as hidden/development-only.
  ☆71Updated 8 months ago
• ficool2 / custom_items_games
  Disable items_games.txt integrity checks in TF2
  ☆17Updated 9 months ago