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But sometimes, there are other incompatible licenses, even for open source software. Sometimes, even if you could build a derived work under GPL, nobody wants to maintain that fork when they could keep using a more-permissive one. So, for example, SBCL is under BSD and public domain licenses, so it doesn't link against Readline. Which makes it really unpleasant to use directly -- if you're used to REPLs from things like Ruby or Python, one where you can't even hit left-arrow while editing a line just seems stupid.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.