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).
SQLGotcha is a tool, written in PL/SQL, to help you find sessions in an Oracle database that you want to trace. Just enter the username, machine, program, Unix PID, or even a table that is accessed. You can use SQLGotcha for both standard and event 10046 tracing, and you can make use of a unique 'waiting' mode.
SQL Developer is a database administration and query tool that provides a single consistent interface for various databases. It allows you to visually navigate through your database structure and create and execute SQL queries and scripts the easy way. It can also reverse engineer complete data models with its integrated diagram editor.
QOF (Query Object Framework), provides a set of C Language utilities for performing generic structured complex queries on a set of data held by a set of C/C++ objects. This framework is unique in that it does not require SQL or any database at all to perform the query. Thus, it allows programmers to add query support to their applications without having to hook into an SQL database.