Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
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.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .