Ranked in these QuestionsQuestion Ranking
Pro C language bindings
Piston has C language bindings if you require usage of C funtions and want to move over from that language.
Pro Open Source
Piston is available for free and its source is hosted on Github.
Pro Abundance of tutorials
There are many tutorials provided by the developers themselves at https://github.com/PistonDevelopers/Piston-Tutorials/tree/master/getting-started
Con Small userbase
There are few developers that use Rust as it is not so popular. Hence there may be a lack of people to ask help from