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The source for the self-hosted compiler reminds me far too much of Principia Mathematica: https://github.com/mlochbaum/BQN/blob/master/src/c.bqn
Front page calls it the 'dreaded' compiler.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Ivy is another APL like language and one I kind of enjoy, because operations are actually readable and writable.
https://github.com/robpike/ivy
NOTE:
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Hence, a higher number means a more popular project.