Dandelion Link is as a community service we run so anyone can use to start building on top of Cardano official APIs right here, right now; without the need of syncing the ledger locally.
And IT'S FREE! Forever. Unless you plan to use it for commercial projects (contact us for that :)
Development
It's developed in GimbaLabs platform and framework. Check the available endpoints here and dunno, maybe, try one of the available Cardano Starter Kits to speak Cardano with your friends and family!