BeeRef is an alternative clone of proprietary PureRef.[0]
Sadly, both PureRef and BeeRef actually are unmaintained.
But for BeeRef there is at least one active fork[1] that still is maintained.[2,3]
[0] https://alternativeto.net/software/beeref/
[1] https://github.com/mini-ninja-64/beeref
[2] https://github.com/rbreu/beeref/issues/62#issuecomment-14476...
[3] https://github.com/rbreu/beeref/issues/61#issuecomment-14490...