Independent data structure headers.
Portable C Datastructures: LinkedList, HashTable, Stack/ArrayList, and StringBuffer with Union
A library of generic intrusive data structures and algorithms in ANSI C
Comprehensive STB style header-only library of data structures implemented in C
A minimal but extreme fast B+ tree indexing structure demo for billions of key-value storage
The non standard template library.
The C Template Library
A hash array-mapped trie implementation in C