HyperDex is described as 'is the next generation key-value store. It provides a rich API, strong consistency, fault-tolerance, and transactions' and is an app in the Development category. There are more than 10 alternatives to HyperDex for a variety of platforms, including Linux, Mac, Windows, BSD and Online / Web-based. The best alternative is MongoDB, which is free. Other great apps like HyperDex are Redis (Free, Open Source), RethinkDB (Free, Open Source), CockroachDB (Free) and memcached (Free, Open Source).
XCache is a fast, stable PHP opcode cacher that has been tested and is now running on production servers under high load. It is tested on Linux and FreeBSD and supported under Windows, for thread-safe and non-thread-safe versions of PHP.