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Syn is highly customizable text and programming editor. Syn features syntax highlighting for many languages, active scripting, macro recording, the ability to launch a program (e.g. a Compiler) and capture the output, support for projects, etc.
Test&Go Developer is a graphical IDE dedicated to the validation and processing of databases and files (XML, XLS, etc.). It creates platform independent scripts which you can configure through python events. It provides a complete plugin interface.