PasswordGorilla downloads:

Version 1.5.3.7:

Linux 32-bit (gorilla1537.bin) GPG signature
Linux 64-bit (gorilla1537_64.bin) GPG signature
MacOSX (gorilla15371.zip) GPG signature
MacOSX (gorilla15372.zip) GPG signature Updated file compatible with new MacOS 'Maverick'
MacOSX (gorilla.mac.15373.zip) GPG signature Updated Tcl runtime to overcome Issue #122 on Github'
Windows 32-bit (gorilla1537.exe) GPG signature
Windows 64-bit (gorilla1537_64.exe) GPG signature
Source code (gorilla-1.5.3.7.zip) GPG signature

How to use GPG signature files