The current head developer has not been able to keep up with maintaining or innovating the coin because of personal reasons. He is willing to hand over the development to someone else.

Here's some info on the coin:
Sonic Coin (ticker symbol SSD)

Sonic Coin provides a complete anonymity solution for cryptocurrencies. It combines the network analysis resistance of Tor with the blockchain analysis resistance of stealth send. Sonic Screwdriver has a fair distribution with nearly four hours of low reward blocks, a small premine of 1%, and the long-term energy efficiency of proof-of-stake minting.

This wallet supports the stake=0 option in the SonicScrewdriver.conf file to disable the stake miner thread for pool and exchange operators.

Info on the Money Supply:
Algorithm: SHA-256d Premine: 0 First Subsidy 8,000 SSD Halving every 1440 blocks (about 1 day) Last PoW block: 20,420 Total PoW Money: 23,037,120 SSD PoS Interest: 20%

Here is a link to the github https://github.com/SonicScrew/SonicScrewdriver

What I liked about this coin originally was that it added privacy to a coin with the same algo as bitcoin. I thought any innovation in this area could eventually be used by bitcoin developers and would make SSD more valuable in that regard. I still think it has that potential even now. Perhaps with some rebranding and development updates this coin can rise from the ashes. I've talked to Russel and he mentioned that it wouldn't take much to get the coin back on its feet. If your interested you can contact the current developer on twitter https://twitter.com/argakiig