I know that Stellar is looking to expand access to low-cost financial services to fight poverty. Are there other cryptos out there with missions like this?
Actually there are many projects that at least since they were conceived in a whitepaper had an idealistic aim seeking to contribute to a more just society, often under a libertarian paradigm of the economy, as in fact the bitcoin had in the beginning. Obviously the massive entry of speculative capital has ruined the idealism behind bitcoin, but projects with well-defined ideals are continually emerging, of which some of the most recent I have known are EqualCoin, Swifdemand and Mannabase.