Freeware Descriptions:
Free SQL Editor for Oracle. Colored syntax, different colors on execution and errors. Multi-document program interface. Multi-threaded execution, possibility to stop execution. Execution SQL and PL/SQL blocks. Execution single and multiple SQL statement (scripts). Explain Plan feature. Reading DBMS_OUTPUT stream. Error positioning. Saving history of all SQL statements. Export results to xls/scv files.
Here is complete features (taken from authors site):

File Size / OS:
- 720 KB / Windows 9x - ME - 2000 - NT - XP - 2003 - Vista
Download SQL Editor for Oracle 3.1: