Open source programs can be very good or ... not so good. But it's free. So there's not much point in complaining.
This one so far is quite good. I read complaints that Inkscape can be slow and I imagine with larger projects this may be true but, so far. It seems to work quite well. The interface is easy to understand and the program seems to work well.
In just about an hour of tutorials I was able to reproduce this old image I drew in Flash some 10 years ago using Inkscape.
The new image is an SVG so, that's cool.
For several years in the early to mid-2000's I was very interested in 3D modelling. I generally used a free program called Anim8or however I did eventually move on to Blender...I still tend to use Anim8or because it's just really simple.
The disappointing thing about these images is that they are all low-resolution. I lost a ton of working files from this era.
These were all done in Flash. I didn't even know what Illustrator was at the time much less knew how to use it. Some of these were professional work for Data Plus Incorporated or contract (Dante's Bar and Fire Grille and Dixie Business park) and others were just for fun.