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Pro Access to a wide variety of Eclipse plugins
Eclipse has a huge community developing plugins that can then be found on the marketplace.
Pro A plethora of configuration options
Each component of Eclipse can be configured separately offering fine grained control.
Pro Free, cross-platform
PDT is available for free on Windows, OSX and Linux.
Pro Modular architecture offers flexibility in setup
Since Eclipse is highly modular by design, relying heavily on plugins for functionality it can be set up so that it includes only the necessary functionality and nothing else.
Con Configuring Eclipse is time-consuming
Setting up Eclipse can be difficult. Each section and each plugin of Eclipse has its own preferences that together add up to lots of tweaking.