Moodle is a course management system (CMS) - a free Open Source software package designed to help educators create effective online courses based on sound pedagogical principles. You can download and use it on any computer you have handy (including webhosts), yet it can scale from a single-teacher site to a 200,000-student University. Moodle has a large and diverse user community with over 50,000 installations worldwide speaking 75 languages in 200 countries.

Mocklinkr is a web application that allows designers to: upload and host their mockups; link them together and make them interactive; and provide a mechanism for their clients to leave feedback.

User experience advice businesses can use. By <a href="http://joshualedwell.typepad.com/about.html">Joshua Ledwell</a>.

MockupScreens, a rapid screen prototyping tool for technical and non-technical users alike. Aimed at software designers, analysts and development teams, MockupScreens lets you to sketch screen mock-ups of your application or web pages and organize them in scenarios. Experiment interactively with your clients, and quickly create clear sofware requirements, while coding hasn't even started yet.

Collection of free software downloads, free game downloads and desktop stuff for windows and palm.

Balsamiq Studios is a fast-growing, but still-very-personable software company that aims to make the world a better place by helping people create software that is easier to use. We like to compete on usability and customer service.

Software tool for wireframes, mockups and prototypes for desktop and web applications. Seamlessly integrates with Aptana, Eclipse, Flash Builder, ColdFusion, MyEclipse, RadRails, RAD and Zend Studio.