Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Coastline - Simple minimalist text editor. Create, open, edit and save plain text files.
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.
Nebulous Notes - Nebulous Notes is a powerful, yet simple, text editor for note-takers, writers, and coders.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .
Jota Text Editor - Jota, pronouced as "i-o-ta", is a text editor designed for a long text file.