Folks can anyone link me to blockchain applications that run on LISK sidechains? Are there any sidechains?
Or is this theoretical and will be implemented in the future?

Maybe I am totally out there...but for those saying that there isnt even one Dapp built for Lisk, you are incorrect.

https://github.com/MaxKK/guestbookDapp

https://blog.lisk.io/lisk-s-first-decentralized-application-arrives-bd933919004#.3zre2phpw

It was posted awhile ago

Lisk Guestbook Dapp...Simple but a great starting template for more complex dapps for those who dev..