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jEdit runs on Linux, OS X and Windows.
Pro Syntax highlighting
JEdit offers syntax highlighting for several languages.
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.