Feeless transactions. IOTA
Fog/Mist computing. SNM, Golem
Decentralized marketplaces. Many, syscoin is my favorite.
Identity tracking for IOT. Centralized solutions might exist, but WTC and the like are interesting.
Decentralized governance. DASH, Lisk, more
Banking the unbankable - Airfox, VVToken, likely others
More efficient advertisement - BAT, AdEx
Paying content creators - Steem
Distributed file storage - FileCoin, MaidSafe, Storj
Uncensorable internet - zencash
BTC gets all the press for first mover advantage, but is really the worst of the bunch.
This is not investment advice. It is quite exciting, however.