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Pro Syntax highlighting
JEdit offers syntax highlighting for several languages.
jEdit runs on Linux, OS X and Windows.
Pro Plugin support
JEdit has lots of plugins that help you customize the editor to your liking. The plugins are easy to download (once you select a mirror) and take effect right away, without a restart.
Con Depends on Java
Because jEdit requires Java to be installed on the OS, it's not suitable for those who don't want Java.