• TCP/IP (allows client/server connection on different hosts)
• UDS (Unix Domain Sockets)
• pipe() based socket api implementation. usefull for embedded devices. (there is no dependency for TCP/IP stack, if clients and server linked in singled app.)
• Memory based pipe(), read(), send(), poll() implementation. xynth is able to work even there is no file descriptor on system.
• mutex and condition variables implementation using semaphores.
• DMA (Direct Memory Access). allows clients to draw directly on graphics buffer.
• Buffer streaming (allows client/server connection on different hosts)
• Move, 8-way resize
• Optional theme plugin support. (theme_*.so)
  .xpm to .so tool.
  
• Anti-aliased fonts with Freetype Library.
  
• Anti-alias enabled low-level graphics library.
  (rgbcolor, colorrgb, setpixel, getpixel, hline , vline, fillbox, putbox, putboxmask, getbox, putboxpart, putboxpartmask, copybox, scalebox, getsurface, setsurfacevirtual, setsurface)
• Anti-alias enabled overlay drawing ability.
  (rgbcolor_o, colorrgb_o, setpixel_o, getpixel_o, hline_o, vline_o, fillbox_o, putbox_o, putboxmask_o, getbox_o, putboxpart_o, putboxpartmask_o, copybox_o, getsurface_o, setsurfacevirtual_o, setsurface_o)
• Basic image library.
  (xpm, png, gif)
  
• Basic widget library.
  (object, frame, button, checkbox, textbox, scrollbuffer, listbox, controllistbox, pushbutton, etc.)
• Low Memory & CPU Usage;
  In 1024x768x32bits mode with 253 clients open mem. usage is ~2,5M
• Static linked binary : ~125K
• Ported Applications;
  Mplayer v1.0pre8 (http://www.mplayerhq.hu)
  links v2.1pre23 (http://links.twibright.com)
  Kaffe v1.1.7 (http://www.kaffe.org)
  
• Ported Libraries;
  GTK v2.4.14 (http://www.gtk.org)
  SDL v1.2.10 (http://www.sdl.org)
  
• Supported Platforms;
  Linux FBDev (http://www.kernel.org)
  SVGALib (http://www.svgalib.org)
  SDLLibrary (http://www.libsdl.org)
  VESA BIOS (http://www.sf.net/projects/lrmi)
  PS2SDK (http://www.ps2dev.org)
  PSPSDK (http://www.pspdev.org)
  GDI (http://mingw.org, http://msdn.microsoft.com)
  GP2X (http://wiki.gp2x.org)

Pick the white paper (xynth_whitepaper.pdf), and presentation (xynth_presentation.ppt) from downloads.

The Doxygen Documentation; (Underconstruction, but good)

The Architecture;

The Protocol;

DMA : Direct Memory Access to the display buffer.
SHM : Shared Memory.
UDS : Unix Domain Sockets.
POLL : Input polling.