Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
Qiqqa - Qiqqa is a free research and reference management software. It can be used in many organizational projects from the academic to the personal to the business endeavor. Read more about Qiqqa.
TeXworks - The TeXworks project is an effort to build a simple TeX front-end program (working environment)...
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Fidus Writer - Fidus Writer is an online collaborative LaTeX editor especially made for academics who need to use...