Emacs vs Eclipse

Emacs can be controlled entirely with the keyboard. While true, I often find the mouse and menus handy for those lesser-used commands. An aide-memoir.

Customizations can be made to a wide range of Emacs' functions through a Lisp dialect (Emacs Lisp). A robust list of existing Lisp extensions include the practical (git integration, syntax highlighting, etc) to the utilitarian (calculators, calendars) to the sublime (chess, Eliza).

You can debug, compile, manage files, integrate with version control systems, etc. All through the various plugins that can be installed.

You can use Emacs' command line interface or graphical user interface.

Emacs has extensive help support built-in as well as a tutorial accessed with C-h t.

With 30+ years of use the Emacs documentation is very thorough. There are also a lot of tutorials and guides written by third parties.

Licensed under GNU GPL.

You can pass complicated arguments in the mini buffer.

Fully compliant GNU-emacs is available on many platforms, and they all understand .emacs configuration files.

Evil mode emulates vim behaviors within Emacs. It enables Vi users to move inside the Emacs universe.

Emacs can select rectangularly.

Evil is an extensible vi layer for Emacs. It provides Vim features like Visual selection and text objects.

With lisp customization, any behavior of Emacs can be changed. Update with pre-release patch can be also applied without recompiling the whole Emacs.

Dynamic word completion.

Advanced planning and publication which can start as a simple list.

Review the "Emacs Rocks" video.

Works on Linux, Windows, Macintosh, BSD, and others.

Powerful commands, search, and more with the Helm plugin.

Since version 25 you can run GTK widgets inside Emacs buffers. One of these is the WebKitGTK+, which allows the user to run a full-featured web browser inside Emacs with JavaScript and CSS support among other things.

Through its programmability, a very broad range of functionalities can be integrated in emacs, turning it even into a "single point of contact" with the underlying operating system.

You can jump straight from your org-mode files to programming tasks - and back - and build a seamless workflow.

Emacs is great for everything.

Managing several large mailing lists has never been easier using Gnus. The threading commands and the various ways of scoring articles means that I never miss important messages/authors, etc. A joy to use.

Eclipse uses a custom compiler (which can also be used outside of Eclipse), which is often faster than the normal Java Compiler, especially for incremental compilation.

Eclipse has a large and active community, which has resulted in a wide variety of plugins.

Thanks to the large variety of plugins and various configuration options, Eclipse is very customizable.

Eclipse is an open source project and free to use.

Because Eclipse is based on SWT, it uses the native font rendering and thus looks better than other IDEs on some Linux systems, where the Java font rendering is not optimal.

Shows threads, concurrency locks, and conditional breakpoints.

The concept of perspectives is outstanding. It puts right tools at your fingertips, keeping the tools you currently don't need out from the workbench. For example, in VCS perspective it's all about versions and branches. In debug perspective it's all about state.
In java ee project it can show http endpoints in a very accessible manner.