This system provides printed and cursive handwriting recognition service as a shared library on GNU/Linux/Unix systems.
Until someone writes another client, try the S/HIP:
https://sourceforge.net/projects/ship-project/
Stylus/Handwriting Input Panel. This is a user-configurable, gesture-aware keyboard/handwriting input panel for text entry on Linux (and other) tablet computers using the X11 system. Needs Ink2Text (<=best) or MSInkServer project for recognition.
Obsolete for most. Use the Ink2Text project instead - no Windows needed! A Linux/Unix library providing full cursive & printed handwriting recognition by connecting to a Windows XP Tablet back end. Need Service & client files.