mathcomp
UniMath
mathcomp  UniMath  

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1.4%  0.4%  
9.0  9.1  
about 18 hours ago  about 9 hours ago  
Coq  Coq  
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mathcomp
UniMath

Will Computers Redefine the Roots of Math?
For those interested in formalisation of homotopy type theory, there are several (more or less) active and developed libraries. To mention a few:
UniMath (https://github.com/UniMath/UniMath, mentioned in the article)
CoqHoTT (https://github.com/HoTT/CoqHoTT)
agdaunimath (https://unimath.github.io/agdaunimath/)
cubical agda (https://github.com/agda/cubical)
All of these are open to contributions, and there are lots of useful basic things that haven't been done and which I think would make excellent semester projects for a cs/math undergrad (for example).

Are There People Doing Formal Math In Berlin?
I just wonder if there are any irl meetups of people involved with formalizing mathematics, I thought that it would be a cool hobby to pick up (with some background in math and programming) but the existing libraries, like MathLib, TypeTopology or UniMath look a bit intimidating...
What are some alternatives?
analysis  Mathematical Components compliant Analysis Library
CoqHoTT  A Coq library for Homotopy Type Theory
regexpBrzozowski  Coq formalization of decision procedures for regular expression equivalence [maintainer=@antontrunov]
aneris  Program logic for developing and verifying distributed systems
TypeTopology  Logical manifestations of topological concepts, and other things, via the univalent point of view.
coqlibraryundecidability  A library of mechanised undecidability proofs in the Coq proof assistant.
rupicola  Gallina to Bedrock2 compilation toolkit
hstocoq  Convert Haskell source code to Coq source code.
coqsimpleio  IO for Gallina
nqthm  nqthm  the original BoyerMoore theorem prover, from 1992