Another example is Mongoose. It's small, easy to config and embeddable(I've used Mongoose on android with NDK with no problem). Unlike H2O, Mongoose is using an old school one-thread-per-request approach, so I would expect the throughput won't be as high as H2O, which seems to be using an event based approach similar to ngnix. Be aware of the license of Mongoose though, it used to be MIT (or apapche?), but now it's GPLv2.