Open CAS accelerates Linux applications by caching active (hot) data to a local flash device inside servers. Open CAS implements caching at the server level, utilizing local high-performance flash media as the cache drive media inside the application server as close as possible to the CPU, thus reducing storage latency as much as possible. The Open Cache Acceleration Software installs into the GNU/Linux operating system itself, as a kernel module. The nature of the integration provides a cache solution that is transparent to users and applications, and your existing storage infrastructure. No storage migration effort or application changes are required.

Open CAS is distributed on BSD-3-Clause license (see https://opensource.org/licenses/BSD-3-Clause for full license texts).

Open CAS uses Safe string library (safeclib) that is MIT licensed.