Nvu
- WYSIWYG HTML editor with site manangement features derived from Mozilla Composer.
- http://nvudev.com/

ActiveState Komodo
- Professional IDE for open source languages, offering advanced support for Perl, PHP, Python, Tcl, and XSLT.
- http://www.activestate.com/products/komodo_ide/

TopStyle Pro CSS Editor / HTML Editor for Windows
- Topstyle uses Gecko as its rendering engine in the Topstyle Pro HTML/CSS/XHTML editor.
- http://www.newsgator.com/NGOLProduct.aspx?ProdId=TopStyle

The ManyOne Network
- The Mozilla-based ManyOne Universal Browser, which aims to be "a more natural, intuitive, educational and entertaining way to explore the Internet over even the slowest Internet connections."
- http://www.manyone.net/

WireSpring - Linux digital signage and kiosk software solutions
- FireCast, by WireSpring Technologies, is a Linux-based platform for deploying and remotely managing networks of interactive kiosks. FireCast OS, the Linux kiosk operating system, uses embedded Mozilla browsers for everything from displaying client content
- http://www.wirespring.com/

NewsMonster RSS Aggregator for Mozilla Browsers
- NewsMonster contains a RSS aggregator, Weblog Manager, and Reputation System and runs in the Mozilla browser. Comes in both Standard and Pro versions.
- http://www.newsmonster.org/

ICEsoft
- ICEsoft includes Rhino, the Java implementation of Javascript in their standards compliant ICEbrowser.
- http://www.icesoft.com/