We're working on getting Gridcoin integrated into Openledger to act as our bridge onto the Bitshares platform: https://cryptocointalk.com/topic/48302-foundation-proposal-4-btc-to-get-gridcoin-added-to-ccedkopenledger/
This will provide Gridcoin presence on:
The Bitshares wallet
https://moonstone.io/
https://openledger.info/
https://freedomledger.com
https://blockpay.ch
Smartcoins wallet
I've been reaching out to Blockstack developers to get Gridcoin integrated into their blockchain application stack.