Inkscape
Used by 22 peopleinkscape.org ↗

“I use Inkscape for vector graphics.”
blackle.mori Interview · via Uses This 
“When I need a bit more flexibility, or want to spin off another variant of the Stan logo, I'll use Inkscape.”
Michael Betancourt Interview, Applied statistician · via Uses This 
“When I need to touch vector graphics, I use Inkscape.”
Eugen Rochko Interview, Developer of Mastodon · via Uses This 
“For vector illustrations, like the cover of this album, I find Inkscape to be far more useable than Adobe Illustrator.”
Adam Wiggins Interview, Hacker, entrepreneur (Heroku) · via Uses This 
“Though I'm beginning to really like Inkscape for more technically oriented drawing.”
Mitch Altman Interview, Inventor · via Uses This 
“The single most important piece of software to me is Inkscape.”
Máirín Duffy Interview, UI designer, usability tester (Red Hat, Fedora) · via Uses This