| C++ user interface toolkit for X and OpenGL | |
| https://www.fltk.org/ | |
| fltk-1.4.9999 | FLTK LGPL-2 |
| download | lanodanOverlay |
| fltk-1.4.9999 | FLTK LGPL-2 |
| download | gentoo |
| fltk-1.4.9999 | FLTK LGPL-2 |
| download | Miezhiko |
| fltk-1.3.9999 | FLTK LGPL-2 |
| download | gentoo |
| fltk-1.3.8 | FLTK LGPL-2 |
| download~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~mips ~ppc ~ppc64 ~riscv ~sparc ~x86 ~amd64-linux ~x86-linux | gentoo |
| fltk-1.3.5-r4 | FLTK LGPL-2 |
| download~alpha amd64 arm arm64 ~hppa ~ia64 ~loong ~mips ppc ppc64 ~riscv sparc x86 ~amd64-linux ~x86-linux | gentoo |