BSPSource
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BSPSource is a GUI map decompiler for 
Source games, written in 
Java.
Based on VMEX, it converts BSP files into VMF ones that can be loaded in Hammer. It also includes numerous bug fixes over VMEX and new features for doing the conversion, such as extracting embedded assets, processing multiple BSPs at once, and more.
Bug:Newer version (1.4.4, 1.4.5) may not launch[1] on some systems (especially with systems with Windows 11 or localized version of the OS). Users can try to install Java 21 (or later) and download the 
bspsrc-jar-only.zip version and run the 
bspsrc.jar file, or alternatively, use older version of BSPSource, or downgrade Windows.
Note:Due to technical reasons, decompiling maps doesn't accurately recreate their original VMF state, often presenting issues such as invalid geometry solids or misplaced areaportal brushes in the decompiled file. 
Workaround: Decompiling the file again or more times may generate better results, such as avoiding some of these issues[Why?].
Note:If there is decompilation protection present, the conversion may be more difficult to work with.BSP with File Packing
In the tab "Other" set tick in in "Extract embedded files". Then put downloaded files in game directory.
BSPInfo
BSPInfo is a mode of BSPSource that instead of decompiling .bsp files, analyses them. Content such as: bsp version, compression type, checksums, AppID, lumps and compile parameters. It can also extract embedded files similiarly to 
GCFScape.
External links
- BSPSource on GitHub
- Java 21 (or later) (optional, for 1.4.4 or later. This is only required if you are using
bspsrc-jar-only.zip(which does not have Java bundled in.)- After installing, try to run the
bspsrc.jarexecutable, or typejavaw -jar "C:\your-bspsrc-folder\bspsrc.jar"in Command Prompt (CMD).
- After installing, try to run the
- Java 8 (required in order to use BSPSource 1.4.3 or earlier)
References
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