Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Anchor CMS - Free and lightweight blogging system
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.
Textpattern - Textpattern is an elegant content management system that is free, open source software.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .