Bibledit can be easily installed on Linux after you have installed a couple of libraries and tools.
Bibledit can be installed on the Macintosh too. It is the same story as with Linux: A couple of libraries are needed to get it going.
As for Windows, a Windows port is now available, see below.
To help you with the installation procedure, some examples are given below.
Bibledit needs the Outpost to interact with Windows related stuff. If there is no such stuff, there is no need to install the Outpost.
There are some 3rd party programs that can work together with Bibledit.