Phototype, a C/S library, based on prototype, supports all image manipulations. On the serverside the library is powered by combination of PHP/GD. With phototype, you are able to rotate, resize, flip and do some other cool effects to images.
Ruby EventMachine is a framework, which depending on who you talk to, either yields a lot of excitement (Evented Mongrel, Analogger, Evented Starling, etc.) or its fair share of criticism.
Annospace is a Flex based application that allows users to comment on shared documents, and essentially have a conversation right in the document. For now its simply a research project.
Streber is a free wiki driven project management tool written in php5. Freelancers and small teams can easily setup projects and keep track of tasks, issues, bugs, efforts etc.
Mugsho is an interesting application – its like a social Photobooth. The Flex based application allows you to put a widget on your blog etc… that allows your visitors to take pictures of themselves, and served as a slideshow on your site.
Rails Widgets is a collection of UI widgets for RubyOnRails that you can put in your own application at the speed of light! With them you can add tabbed navigation, tables, tooltips in a snap. They’re lightweight and easy to use, give them a spin!
AtMail is an open source webmail client written in PHP. We aim to provide a elegant Ajax webmail client for existing IMAP mailservers, with less bloat and a focus on an intuitive, simple user interface.
LiquiBase is a DBMS-independent library for tracking, managing and applying database changes. It is built on a simple premise: All database changes (structure and data) are stored in an XML-based descriptive manner and checked into source control.
Textmate already has a centralized svn repository for its bundles, and there’s a way, through AppleScript, to tell Textmate to reload bundles. The end result: a textmate binary that handles textmate bundles like gems.
Webmonkey is a free, public resource for web developers. Builders, designers and programmers like you — the people who know best — write the articles, tutorials, code snippets and other contributions.
Ruboss Framework: a framework that aims to take Flex and Rails development to the next level by making the whole process a lot easier and more integrated.