The blog article:
http://lightning.community/software/lnd/lightning/2017/07/05/emerging-lightning-developer-ecosystem/
Slack TipbotLightning MacOS GUI WalletMobile and Desktop app for Lightning
I only listed a few applications, you can check more on the link I gave above. Just imagine the possibilities here, LN is not even launched yet but there is a lot of developers working on different projects! I'm honestly very excisted about this and I'm only hoping that 1st august will go as planned at this point.