Top 3 C Set Projects

mlib

8 790 8.9 C

Library of generic and type safe containers in pure C language (C99 or C11) for a wide collection of container (comparable to the C++ STL).

Project mention: preprocessor stuff - compile time pasting into other files | /r/C_Programming | 2023-12-09

This uses the preprocessing library

Containers

2 162 1.8 C

This library provides various containers. Each container has utility functions to manipulate the data it holds. This is an abstraction as to not have to manually manage and reallocate memory. (by bkthomps)
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ctl

22 158 5.9 C

My variant of the C Template Library (by rurban)

Project mention: A header-only C implementation of C++ <algorithm> | news.ycombinator.com | 2023-07-03

Well, I do like mine better, which is closer to the STL, and for all containers. https://github.com/rurban/ctl/

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).