Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing. It is open source by Pivotal (Pivotal GemFire Core).
You can connect to Apache Geode through the following interfaces:
ray2501: I write a Tcl extension GeodeREST and play Apache Geode REST Interface.
For memcached interface, you can use memcached-for-Tcl to access.