Persevere - JSON storage server
The Persevere Server is an object storage engine and application server (running on Java/Rhino) that provides persistent data storage of dynamic JSON data in an interactive server side JavaScript environment.
Preparing For EC2 Persistent Storage
Using LVM + DRBD + NFS + Heartbeat + VTun To Gain Data Persistence, Redundancy, Automatic Fail-Over, and Read/Write Disk Access Across Multiple EC2 Nodes
neo4j
“Neo is a netbase — a network-oriented database — that is, an embedded, disk-based, fully transactional Java persistence engine that stores data structured in networks rather than in tables. You can think of Neo as a high-performance graph engine with all the features of a mature and robust database” — Sounds perfect for traversing-the-socialgraph type things
rapidxml
“an attempt to create the fastest XML parser possible”
Response to "Subversion’s Future?"
Pretty much the exact post I’ve been meaning to write for a while; DSCMs fit remarkably well into the “enterprise”, whether that means large distributed teams, or heavy processes with lots of separation between the layers and/or teams.