A new version of zx81paint has been uploaded to AmiNet.

zx81paint has just learned a couple of new things: 15 steps of undo, drawing lines and rectangles, better menu layout, and slightly improved keyboard control.

Lines! Rectangles!

See Readme-file for usage information, and more.   

Get it from AmiNet:
http://aminet.net/package/gfx/edit/zx81paint