If you’re interested in the history of Garry’s Mod you’d be interested in this!

2011

• 24th July – Surpassed 1,000,000 sales
• 1st March – HL1: Source NPCs added
• 8th February – Player breathing added

2010

• 1st October – VAC activated
• 23rd September – Garry’s Mod for Mac released
• 21st September – 100th Steam update
• 7th September – Toybox tab added to Spawnmenu in Singleplayer
• 29th July – Added gamemode “Dogfight: Arcade Assault”
• 29th July – Added gamemode “Trouble in Terrorist Town

2009

• 26th August – Added first achievements

2008

• 16th January – Switched to use the Orange Box Engine
• 16th January – Added support for Team Fortress 2, Half-Life 2: Episode Two and Portal

2006

• 29th November – Garry’s Mod released on Steam
• 3rd February- garrysmod.org is born

2005

• 27th November – Garry’s Mod 9.0.4 released (last free version)
• 28th October – Garry’s Mod 9 released (Added serverside Lua scripting)
• 12th Feburary – Garry’s Mod 7 released (added easy weld, duplicator, sliders)
• 29th January – Garry’s Mod 6 released
• 9th January – Garry’s Mod 5 released
• 5th January – Garry’s Mod 4 released (added camera, simple DOF)

2004

• 30th December – Garry’s Mod 3 released
• 27th December – Garry’s Mod 2 released
• 24th December – Garry’s Mod 1 released (first ever release)