Atom is a free open-source code editor from Github.

Textadept is a free software minimalist text editor designed for computer programming.

Vim is a clone of vi text editor program for Unix.

Bluefish is a free software advanced text editor with a variety of tools for programming in general and the development of dynamic websites.

Lime Text is an Open Source, Elegant, and Free Text Editor.

Codility.com is a platform to hire developers and other resources.