"Fields for storing serializable data." Includes field types for JSON and Python's Pickle format.

"A graph database on top of tokyocabinet and libevent "

"ShardQuery is a PHP class which is intended to make working with a partitioned dataset easier. It offers an easy to use PHP class interface for querying the dataset. Also included is run_query.php, which is an example application for the ShardQuery class."

indeed

"A light but powerful flat file database package. It should be noted that many PHP installations come with the SQLite extensions already enabled. If available, SQLite will usually be a far superior alternative to a flat file database."

"realStorage is meant to create a consistent API for the W3C Web Storage key/value store specification (i.e. work around browser bugs). It also adds some convenience functions to help flesh out the localStorage key/value API. And when Web Storage is not available, a Gears fallback is provided."

"Persistence layer abstraction for PHP with just-in-time fetch, caching, and multiple database support"

"Ottoman is a lightweight, reliable key-value store with multi-version concurrency control."

"As larger and larger amount of memory become common (512GB is something you can fit into relatively commodity server this day) many customers select to build their application so all or most of their database (frequently Innodb) fits into memory."

"Redis is a key-value database. It is similar to memcached but the dataset is not volatile, and values can be strings, exactly like in memcached, but also lists and sets with atomic operations to push/pop elements."

"Voldemort is a distributed key-value storage system... Voldemort is not a relational database, it does not attempt to satisfy arbitrary relations while satisfying ACID properties. Nor is it an object database that attempts to transparently map object reference graphs. Nor does it introduce a new abstraction such as document-orientation. It is basically just a big, distributed, persistent, fault-tolerant hash table." -- Via the folks at LinkedIn.

"MemcacheDB is a distributed key-value storage system designed for persistent. It is NOT a cache solution, but a persistent storage engine for fast and reliable key-value based object storage and retrieval. It conforms to memcache protocol(not completed, see below), so any memcached client can have connectivity with it. MemcacheDB uses Berkeley DB as a storing backend, so lots of features including transaction and replication are supported." Hott++

Database migrations for Google Gears, similar to those found in Rails and other popular web frameworks. Be nice if they'd offer up something for HTML 5's storage APIs as well.

This is South, intelligent schema migrations for Django apps.

Sometimes I follow this... it is a little verbose for my taste... it does have the nicety of being extremely hackable (code generation, graphing, etc)

Cough is an extremely lightweight PHP ORM framework for dealing with objects that have single table counterparts in a database. Cough is built to be easy to learn, use, and extend.

"This file contains an example of how to use SQLite to store and retrieve blob data. Blobs are stored in the database indexed by a string key."

"With virtual tables, you query not only what is in a database, but what is outside of it as well. For instance, with a little coding, you could use SQLite to search through your filesystem"

Official PR speak from Oracle. It does nicely point out that this means MySQL users can keep current with InnoDB without waiting for updates to MySQL itself.

I believe this is InnoDB's first major release since being acquired by Oracle.

"In this positing I would like to try to collect some of the principles and abstractions related to large scale data replication and the trade-offs between high-availability and data consistency"

a lightweight database abstraction layer suitable for high-load websites where you need the scalable advantages of connection pooling.

"buzhug is a fast, pure-Python database engine, using a syntax that Python programmers should find very intuitive The data is stored and accessed on disk (it is not an in-memory database)"

notes on using sqlite3 with CI.

"In non technical terms libferris makes the file system and other hierarchical storage systems easier to use. For the geeks out there, libferris is a virtual file system (VFS) that runs in the user address space."

Collection of RDF tools written largely in Python by Sean Palmer

"Kowari is an Open Source, massively scalable, transaction-safe, purpose-built database for the storage, retrieval and analysis of metadata. Kowari is written in Java and licensed under the Mozilla Public License."

Paul Ford's intro to the then in beta BDBXML. Bookmarking for use when describing what exactly it is to others.

Low level C library for dealing with triple stores. Can be used as a backend to Redland.