IDAJscript is a basic integrated development environment for scripting IDA disassembler with JavaScript. Versions are available for both 32bit and 64bit (v7+) of IDA

It includes support for many modern features such as syntax highlighting, brace matching, intellisense and a built in debugger.

This has been my default scripting tool for over a decade now. View Screen Shot

As a bonus, the IPC plugin used to interact with IDA can be used from any programming language. Examples are provided for C, Python, Java, Vb6, C#, and Delphi. A standalone ActiveX library is also included.