Neovim is a project that seeks to aggressively refactor Vim in order to: simplify maintenance and encourage contributions, split the work between multiple developers, enable the implementation of new/modern user interfaces without any modifications to the core source, and improve extensibility with a new plugin architecture.
GNU Emacs is an extensible, customizable text editor—and more. At its core is an interpreter for Emacs Lisp, a dialect of the Lisp programming language with extensions to support text editing.
Vim is an advanced text editor that seeks to provide the power of the de-facto Unix editor 'Vi', with a more complete feature set. Vim is a highly configurable text editor built to enable efficient text editing. It is an improved version of the vi editor distributed with most UNIX systems. Vim is distributed free as charityware.
SpaceVim is a Modular configuration, a bundle of custom settings and plugins, for Vim. It got inspired by spacemacs.
It is a popular developer productivity extension for Microsoft Visual Studio. It automates most of what can be automated in your coding routines. It finds compiler errors, runtime errors, redundancies, and code smells right as you type, suggesting intelligent corrections for them.