RFI: Precursors Official Client

Illarion   (Compare Project)

Mostly written in Java

License: AGPL3_or_later, Proprietary

Irrlicht Engine   (Compare Project)

License: zlib_libpng

OctaForge   (Compare Project)

License: cc-by-3, ccbysa3-0, CC0-1-0, u_of_i_ncsa, zlib_libpng

PlaneShift   (Compare Project)

Mostly written in C++

License: Closed_Licence, gpl

Qt 5   (Compare Project)

Mostly written in C++

License: Commercial, GNU_Free_Documentation_License, gpl3, lgpl21

Crystal Entity Layer   (Compare Project)

License: lgpl

Urho3D   (Compare Project)

Mostly written in C++

License: mit

Eternal Lands official client   (Compare Project)

License: Unknown

Crazy Eddie's GUI System   (Compare Project)

License: mit

Evernus   (Compare Project)

License: gpl3