SimpleDBM is a multi-threaded transactional database engine. It has a very small footprint and can be embedded in the address space of an application, or used in network client server mode. It provides a simple programming API that can be learned very quickly. SimpleDBM supports ACID transactions, steal/no-force buffer management, lock-based concurrency, row level locks, b-tree indexes, tables, write ahead log, crash recovery, and deadlock detection.
TurnKey PostgreSQL Appliance is a server appliance for PostgreSQL, a fully-featured object-relational database with many enterprise features: ACID transactions, inheritance, Unicode, and strong support for the SQL-92 standard including subqueries, views, outer joins, foreign keys, sequences, and triggers. It is designed to be easy to use and easy to maintain. Security patches are automatically installed. It provides a Web management interface, configuration console, and an AJAX Web shell. To minimize footprint the appliance is built from the ground up with the minimum required components. It runs everywhere thanks to multiple build formats, including an installable live CD, a VMDK with OVF support, and an Amazon EC2 AMI.
TurnKey MySQL is an extremely easy way to get up and running with MySQL in just a couple of minutes. It's a pre-integrated turnkey server based on Ubuntu that is packaged as a Live CD image capable of supporting installations on both physical and virtual machines, including VMWare, Xen, VirtualBox, and KVM. It features a small footprint, automatic security updates, a rich Web administration interface, and an easy to use configuration and installation console. It includes a phpMyAdmin database management front-end.
Itzam is an embedded database engine that creates and manipulates files containing keyed-access records. Information is referenced by a user-defined key value, and one or more indexes (hash, B-tree, or matrix) may be combined with or separated from data. Itzam is deliberately portable and designed as a foundation for other languages (C++, Python, and Java).
pgFouine is a PostgreSQL log analyzer. It allows you to have a clear overview of your database activity, and can generate reports with slowest queries, most frequent queries, errors, graphs, and so on. It is written in PHP and is designed to parse huge log files with a low memory footprint.
Zmanda Recovery Manager (ZRM) for MySQL simplifies life of a database administrator who needs an easy to use yet flexible and robust backup and recovery solution for MySQL server. With ZRM for MySQL, you can schedule full and incremental logical or raw backups of your local or remote MySQL database, perform a backup that is the best match for your storage engine and your MySQL configuration, get encrypted and compressed backups, get email notification about the status of your backups (including RSS feeds), monitor and get backup reports, and recover a database easily to any point in time or to any particular transaction.
Itzam/Java is a pure Java reimplementation of the Itzam embedded database engine, and it is 100% interoperable with files created by Itzam/Core. Since Itzam/Core is the basis of wrappers written in languages such as C++ and Python, Itzam/Java is compatible with those language libraries as well.
BlackRay is a relational database system designed to offer performance features commonly associated with search engines. It offers SQL support and sophisticated operational and management features. Load-balancing and operational stability by means of N+1 redundance are included. BlackRay is called a "Data Engine" since it combines traditional, relational database features and SQL with the power and flexibility of search engines. It is a true hybrid, offering transaction support, data-versioned snapshots, and sophisticated function-based indices. Wildcards, phonetic, and fuzzy logic searches are supported, as well. BlackRay supports a subset of the SQL92 standard and provides JDBC/ODBC/native driver options via the PostgreSQL protocol, in addition to an API based query option. The project is released under the GPLv2, with some drivers available under BSD-style licenses. Commercial support contracts are available as well.