I've written a simple SSTV library that can be easily built with the GNU toolchain for Linux and other embedded systems. Should be fairly fast and efficient. Currently only performs encoding (was priority for some HAB experiments this library was meant for) but will implement decoder as soon as I have the time. Supports FAX480, ROBOT BW/C, SCOTTIE S1-S4 and DX, MARTIN M1-M4, PD50-PD290. MIT license, so do (almost) whatever you want with it . I'll be happy to help whoever wants to use it in their projects.