Editplus

EditPlus is an Internet-ready 32-bit Text editor, HTML editor and Programmer's editor for Windows. While it can serve as a good replacement for Notepad, it also offers many powerful features for Web page authors and programmers.

JDecompiler is a very small tool, that can use your favorite text editor (eg: EditPlus) to decompile and view the java class file.

Java Help is a swift Java API lookup program. Designed to be invoked from a text editor, Java Help lets you search multiple APIs with a single keystroke. Place the cursor on a word you want to search for and press a key; Java Help comes right up.