Full stack blockchain development ecosystem providing native identity, blockchain, token creation and more as API's for developers, as well as a browser for end-users to interact with dApps on the Blockstack platform.  Their mission seems to be to cater to developers that want to create decentralized applications and they provide a full technology stack to developers to build dApps on the Blockstack platform, and for users to access dApps on the Blockstack platform.

Good interview of the founders on this episode of unchained podcast:

Project Home Page: