The Coolest DHTML Calendar is a DHTML calendar widget that works with IE >= 5.0, Mozilla, Netscape >= 6, all other Gecko-based browsers, Opera 7, Konqueror, and Safari. It comes with eight color themes, and doesn't use frames or external windows, but uses Web standards and is lightning fast. Keyboard navigation is allowed, and it can optionally show a time selector.
SiteBar is a multi-user, multi-group bookmark server that lets users view, add, import, and maintain bookmarks from anywhere. It offers enterprise-quality access rights and granular permissions. Corporations can use it as a complete intranet bookmark solution, and end-users can use it to access their bookmark collection from anywhere, and share it with friends. It is intended for use in a browser's sidebar, and offers a clean, easy to use interface.
blueflops is a two-floppy Linux distribution with a graphical Web browser (links) and an IRC client (rhapsody). The kernel has most of the Ethernet drivers compiled in as modules (including the PCMCIA ones) and PPP support (for dialup connections). The browser is linked with OpenSSL. The scripts are all accessible by a setup script and have a nice dialog frontend.
tengis is a bookmarks manager that uses keywords to create a graph of bookmarks, which can then be used for searching. The advantage is that the user doesn't have to choose a single tree node to put his bookmarks in and searching is easier. The implementation binds with external Web browsers, and its file format is extremely simple.