Top 3 C++ compile-time-meta-programming Projects

movForth

1 80 3.3 C++

LLVM frontend for the Forth Language
mlib

1 43 7.1 C++

mlib is a fast, simple c++ meta-programming library that uses c++20. (by robertshepherdcpp)
InfluxDB

www.influxdata.com featured

Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
SpeciaLUT

3 26 3.4 C++

Runtime choosing of template specializations using compile-time lookup-tables. Compile all states of a template function, but execute the optimal one at runtime.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).