Here are copies of external libraries used on CARTO Mobile SDK. Some projects are modified to port them to work on all required mobile platforms.
Use git submodule to resolve all source-level dependencies
git submodule update --init --remote --recursive
No need to compile any of the libraries here. For Windows Phone build, libs-external/angle/prebuilt/angle.zip file should be unpacked in place.
All the projects have non-viral open source licenses. See License and Readme files for each.