If you're looking for alternative high-performance NoSQL solutions, you might be interested in this new Redis-esque entry based on LevelDB and written in Go: LedisDB. You can find details on the homepage and grab it from GitHub, but according to the author (on the GitHub page), the key features look like this:

• Rich advanced data structure: KV, List, Hash, ZSet, Bit.
• Uses leveldb to store lots of data, over the memory limit.
• Supports expiration and ttl.
• Redis clients, like redis-cli, are supported directly.
• Multi client API supports, including Golang, Python, Lua(Openresty).
• Easy to embed in Golang application.
• Replication to guarantee data safe.
• Supplies tools to load, dump, repair database.

And for a sense of how it stacks up compared to competitors, the author's also provided a benchmark:

It looks like a pretty interesting project for Redis users or Golang believers. Check out the full site for all the details.