header only

hopp | Header-Only Program Parts | Basic (but useful), modern and generic C++11/C++14 header-only library | Apache License, Version 2.0 | GNU Affero General Public License 3+

Thōth | Modern and generic C++11/C++14 header-only library for GUI and games | GNU Affero General Public License 3+

aonl | Automatically Optimized Numerical Library | Simple, modern and generic C++11/C++14 header-only numerical library | It aims to be optimized by a polyhedral compiler | Apache License, Version 2.0 | GNU Affero General Public License 3+