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Other Window Toolkits
FLTK
Gtk/Gtkmm
Fox
Qt
wxWidgets (formerly wxWindows)
Tcl/Tk
Rapicorn
Juce, has lots of audio classes
Various Specifications
ICC Color Profile
Adobe Postscript
Adobe PDF
Jpeg
Png
Tiff
Midi
SVG
HTML
VRML97
X3D
OpenGL
OpenML
Type1
XML
Unicode
MathML
(note that the debian package xspecs provides documentation for Xlib and related libraries)
xlib
Icccm
FreeDesktop.org, has many interesting specifications
OASIS OpenDocument
Yaml, a file format based on indentation.
Various Libraries
gegl
libmagick
libxpm
libpng
X11
cups
lcms
freetype
fontconfig
Imlib2
cairo
libart
Enlightenment Foundation Libraries
Antigrain