I'm the co-creator of
'The Greys' and
'Monsters, Inked' webcomics which are both available under a Creative Commons licence.
I use the Free vector graphics program
Inkscape to create
'The Greys' and to trace, colour and letter
'Monsters, Inked'. We even make the Inkscape source files for all our
'Greys' comics available to download.
Most of our comics are available here on dA, so have a browse round
my gallery, and hopefully have a chuckle in the process.