Half-Life Unified SDK Map Decompiler by SamVanheer - is a powerful tool used to decompile Half-Life 1 BSP version 29 and 30 files. It stands out from other similar decompilers as it is written in C#, making its source code more accessible and easier to maintain. It also supports original Half-Life Alpha 0.52 BSP files. The application stores user configuration files in AppData/Roaming/Half-Life Unified SDK on Windows and home/.config on Unix systems.