BBC R&D bbc.co.uk

3D CineCast 3dcinecast.blogspot.com

Site zalando.github.io

Site wikidocs.net

Site upstart.ubuntu.com

Site swaroopch.com

Site squeakbyexample.org

OmegaT sourceforge.net

Free Software Foundation - books/documentation shop.fsf.org

Site restfulwebapis.org

Site realworldocaml.org

Site practicingruby.com

Site pharobyexample.org

Site osdi.insightbook.co.kr

O'Reilly Open Books oreilly.com

Site open.umich.edu

OnlineProgrammingBooks.com onlineprogrammingbooks.com

Site nlpwp.org

Site mattmahoney.net

Site lucumr.pocoo.org

Site learnyousomeerlang.com

Site leanpub.com

Site jstatsoft.org

JSbooks jsbooks.revolunet.com

Site heather.cs.ucdavis.edu

Site groklaw.net

Green Tea Press greenteapress.com

Site gnu.org

Site gnu.org

Bootstrap github.com

Sphinx documentation github.com

The Rust Programming Language github.com

Rails Guide github.com

Redux Document github.com

CasperJS github.com

Vagrant github.com

Packer Documentation github.com

Font Awesome github.com

React Document github.com

Docker github.com

Django Documentation github.com

Ansible Documentation github.com

Solarized github.com

Gitbook gitbook.io

Site gitbook.com

Flux Application Architecture facebook.github.io

Wikipedia books(community books) en.wikipedia.org

Site en.wikibooks.org

Site egr.unlv.edu

Site docutils.sourceforge.net