YASQL is an open source Oracle command line interface. It features a much kinder user interface than SQL*Plus (sqlplus). This is meant to be a complete replacement for SQL*Plus when dealing with ad hoc queries and general database interfacing. It adds features such as full ReadLine support for command history and tab completion, alternate output methods, table, list, CSV, redirection and piping of query results, query editing, scripting, and easy administrative data dictionary commands.
ZAP! is a module which makes it fairly straightforward to build WWW-based user interfaces for groups of Z39.50-based information resources. It hides much of the complexity of the underlying protocol and requires mostly an understanding of HTML and some understanding of the Z39.50 database model.
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.
Zoned manages BerkeleyDB zone databases using the BDB Replication Base API. It manages all node communication and eases the difficulties that BerkeleyDB replication imposes (such as making sure that all zone changes go straight to the master node for transaction processing). It requires the BIND9 DLZ BDBHPT driver.
ZooLib allows one to write a single set of C++ sources which can be compiled into native executables for Mac OS, Windows, BeOS, or POSIX-compliant systems that use the X Window system (such as Linux). Zoolib provides a GUI toolkit with a uniquely flexible layout system. It also provides a single-file database format, TCP networking, and extensive debugging support. ZooLib applications are multithreaded. ZooLib requires only minimal support from the underlying OS and platform GUI layer, and thus could be ported to a completely new platform without too much difficulty. ZooLib is fully production quality on Windows and MacOS, completely implemented but untested on BeOS, and not yet complete on POSIX. Please note that the sources from the "demo" branch are also required to build ZooLib or to get started writing your own ZooLib applications.