You can trade them: https://www.cryptsy.com/markets/view/CINNI_BTC
And buy back STK here: https://yobit.net/en/trade/STK/BTC

For CINNICOIN is no development (for STK I don't know yet).
Idea:
Maybe CINNICOIN can give them a second change and swap StakeCoin and CinniCoin into a "new coin".
Idea2:
EnergyCoin and some other coins can also be part of the swap and then we have two or more exchanges for the "new coin".
A fresh blockchain and maybe a bigger more active community if some small (PoS) coins are merged.

CINNICOIN you have just to ask cryptsy for a coinswap, you are I think still the official developer.
I can ask Bittrex for the coinswap and then merge our coins if we are agreed.

More currencies are maybe intrested if we present a plan for application.
For EnergyCoin I work on an application check: http://www.gorillastake.com/social/blog/view/331/energycoin-the-green-cryptocurrency-of-the-future
Potential other coins I like to have on board:
- OrangeCoin
- GreenCoin
- CarbonCoin
I have a very skillfull developer who can help us to manage this.
The name for the new coin platform: EnergyCoin Ecosystem Platform EEP

But StakeCoin and EnergyCoin can go their own way, no problem this is just an idea I have in mind.
With this idea 1+1 = more then 2!