Skyscanner - Skyscanner.com compares over 1000 airlines to find you the cheapest airfares, fast.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Kiwi.com - Find and book the best low-cost flights all around the world
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.
App in the Air - The perfect companion for everyone taking a flight.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .