PopKey for Desktop - Quickly share ridiculous GIFs from Mac or Windows
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Vlipsy - Easily add your favorite video clips to any conversation.
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.
Giphy For Gmail - Add the power of GIFs to your email
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.