Ecosyste.ms: Packages
An open API service providing package, version and dependency metadata of many open source software ecosystems and registries.
spack.io "single-file" keyword
gsl-lite
A single-file header-only version of ISO C++ Guidelines Support Library (GSL) for C++98, C++11, a...Latest release: 6 days ago - 794 stars on GitHub - 4 maintainers
string-view-lite 1.7.0
A single-file header-only version of a C++17-like string_view for C++98, C++11 and later6 versions - Latest release: about 1 year ago - 361 stars on GitHub
optional-lite 3.6.0
A single-file header-only version of a C++17-like optional, a nullable object for C++98, C++11 a...10 versions - Latest release: about 1 month ago - 363 stars on GitHub
span-lite 0.10.3
A single-file header-only version of a C++20-like span for C++98, C++11 and later9 versions - Latest release: over 1 year ago - 440 stars on GitHub