Sesame Database Manager - Lantica Software, LLC - Sesame, A Q&A-compatible Database Manager.
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
XtraBuild Designer - XtraBuild offers software development tools for database and reporting applications. No coding!
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Sheep - Membership and events for SMEs and nonprofits
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.