A micro software algorithms template library for embedded-C. Re-introducing C++ procedural, object-oriented, and generic programming paradigms in vanilla C, the library remains container agnostic.
To know, most of the procedural programming cross-target engine and logic is provided by mu0, e.g. C is an imperative procedural language by nature and definition. The generic programming interface is supported through C-macro directives i.e. meta-programming for preprocessing and then compile-time code generation (limitation: no possible recursivity) while the object-oriented programming interface is via operator-functional indirections and abstractions.
Most of type-independent algorithm front-ends follow the same design in mind as the STL: https://en.cppreference.com/w/cpp/algorithm for temporary reference. Last, for the embedded C++ community, I think it is also interesting to have a look at the excellent John Wellbelove's Embedded Template Library: https://github.com/ETLCPP/etl.