jEdit is awesome. Its written in Java and has a lot of features for Java programmers but also has good code highlighting and folding for many other languages and markup formats. Best of all it has a plug-in architecture which has received a lot of support.
The most useful plugin I've found is the jdiff plugin. It lets you diff between frames (you can horizontally and vertically split a window into any number of frames and open any number of windows). Because you can edit both frames as you also see the diffs highlighted, its a great way to port or backport your code changes between different code branches.
Being a Java app also means you can use the same editor on all the platforms you run.
The most useful plugin I've found is the jdiff plugin. It lets you diff between frames (you can horizontally and vertically split a window into any number of frames and open any number of windows). Because you can edit both frames as you also see the diffs highlighted, its a great way to port or backport your code changes between different code branches.
Being a Java app also means you can use the same editor on all the platforms you run.
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