Xmind - Xmind is a brainstorming and mind mapping application.
Imagus - The extension is intended to complement image features that (I think) is missing from Opera by...
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Image Max URL - Help find larger or original versions of images, including a customizable image popup feature
FeatureMap - FeatureMap story mapping, simple and effective realtime collaboration and collective intelligence tool.
Thumbnail Zoom Plus - The official site of the Thumbnail Zoom Plus add-on for Firefox