Depend of what I have to draw... - TikZ good for nearly anything, the best results in any case, but a bit time-consuming. I use it only when I really need to d

Depend of what I have to draw... - TikZ good for nearly anything, the best results in any case, but a bit time-consuming. I use it only when I really need to draw impressive things (that happen really rarely); - Dia (Gnome) works well for various / casual / simple stuff especially because of it's variety of icons/block libraries immediately available. I use it to made quick stuff that does not really need to be "visually impressive" and I do not have too much interest in them; - Ditaa (with org-mode) is nice for simple/quick drawings for witch pure TiKz is overkill and Dia as an external tool is overkill due to the simplicity/regularity of the drawing itself; - Matplotlib with Python or Hy can be a nice tool depending on what kind of diagram I have to produce; - Last mentioned, more as a curiosity since I discover it recently and essentially tested only for play: https://github.com/cuichaox/dml https://github.com/cuichaox/dml