Here are some MySQL optimization techniques for programmers. from nettuts+.

A persistent key-value database with built-in net interface written in ANSI-C for Posix systems

This is the home of a free O’Reilly Media book about Apache CouchDB.

Propel is an Object-Relational Mapping (ORM) framework for PHP5. It allows you to access your database using a set of objects, providing a simple API for storing and retrieving data.

Grubba is the free and online alternative for MS access and Filemaker pro.

non-relational databases.

Bigtable is a distributed storage system for managing structured data that is designed to scale to a very large size: petabytes of data across thousands of commodity servers. a Google Research Publication.

Databases on toxicology, hazardous chemicals, environmental health, and toxic releases, from National Library of Medicine.

Detailed information on more than 11,200 chemicals, including all the chemicals used in large amounts in the United States and all the chemicals regulated under major environmental laws.

Following a handful of best practices in database design will improve speed and efficiency for most web applications.

a distributed, fault-tolerant and schema-free document-oriented database accessible via a RESTful HTTP/JSON API. from apache.

relationships-entities model, common database design mistakes, database normalization.

improved php mysql extension information.