Syntax highlighter: prism.js
WYSIWYG: Summernote (summernote.org)
UI/UX design and front-end: Marcin Wysmułek
Back-end: Marcin Wysmułek with BiplaneCMS
And it is still free, download now and enjoy! Beta is no longer supported.
BiplaneCMS is extremely easy to implement. You can connect it to any front-end you have. In a few super easy steps. See details in our docs.