Cabalist is conceived as a simple way of adding some smarts (machine learning capabilities) to your Ruby on Rails models without having to dig deep into mind-boggling AI algorithms. Using it is meant to be as straightforward as adding a few lines to your existing code and running a Rails generator or two.

Adapter for LevelDB

Campchair is simple persistence mixin using LevelDB and Marshal to persist Ruby objects.

Embedded Queueing. Background processing within a single process using multi-threading and a SQL database.

Graph database on leveldb using paxos protocol ideas.

Rack session store for LevelDB

a lightweight background processor

Imports Wikipedia dumps to a local database and lets you browse them from the commandline or with a local sinatra server.