Persevere - First impressions

The Persevere project is an open source set of tools for persistence and distributed computing using intuitive standards-based JSON interfaces of HTTP REST, JSON-RPC, JSONPath, and HTTP Channels. The core of the Persevere project is the Persevere Server. The Persevere server includes a Persevere JavaScript client, but the standards-based interface is intended to be used with any framework or client.

The interesting thing about this is that they mention capabilities in their security model, and they offer support for pluggable security modules. So, even if they don't due "pure" capabilities, someone else could add a library that does.