FLTK 1.4.0
Here is a list of all modules:
 Callback function typedefsTypedefs defined in <FL/Fl.H> for callback or handler functions passed as function parameters
 Windows handling functionsWindows and standard dialogs handling declared in <FL/Fl.H>
 Events handling functionsFl class events handling API declared in <FL/Fl.H>
 Selection & Clipboard functionsFLTK global copy/cut/paste functions declared in <FL/Fl.H>
 Screen functionsFl global screen functions declared in <FL/Fl.H>
 Color & Font functionsFl global color, font functions
 Drawing functionsFLTK global graphics and GUI drawing functions
 Multithreading support functionsFl multithreading support functions declared in <FL/Fl.H>
 Safe widget deletion support functionsThese functions, declared in <FL/Fl.H>, support deletion of widgets inside callbacks
 Cairo Support Functions and Classes
 Unicode and UTF-8 functionsFl global Unicode and UTF-8 handling functions declared in <FL/fl_utf8.h>
 Mac OS X-specific symbolsMac OS X-specific symbols declared in <FL/platform.H>
 Common Dialogs classes and functions
 File names and URI utility functionsFile names and URI functions defined in <FL/filename.H>