Cross-platform external injection software for the GoldSource Engine that provides additional speedrun-related features such as in-game timer, speed info, etc. https://github.com/YaLTeR/BunnymodXT (external link)

By YaLTeR

All-in-one package containing Bunnymod XT, RInput and all major GoldSrc games. (external link)

By PJC, YaLTeR

Highly customizable demo capturing software. (external link)

By ripieces

Just unzip it and replace the original city2a.bsp with this one and it should fix the disappearing HUD. More Info: http://sourceruns.org/index.php?topic=2481.0 (direct download)

By Lesterre