If you're not experienced in JavaScript, hearing jQuery is great but thinking it can be something difficult or want to improve your jQuery skills, you might love this.
jQuery Fundamentals is a free online book (there are PDF and ePub versions too) that can be a guide for any developer but specially for JS and jQuery beginners.
Website: http://jqfundamentals.com/book/book.html
Telerik, a very talented company that mostly creates resources for the Microsoft products, is sharing a set of 3 free Silverlight controls: Book, Gauge and TileView.
They are natively built on top of Silverlight 4 and have the capabilities of the platform, such as clipboard integration, right-click support, multi-touch support and more.
http://www.telerik.com/products/free-silverlight-controls.aspx
For many, wireframes are a part of the design process as they help a lot when thinking and discussing on a design.
Wirify is a bookmarklet which reverses the standard process and converts any given web page into a wireframe.
http://www.wirify.com/?ref=intro
TinyLetter is a free-to-use web service which enables us to create an e-mail newsletter and get subscribers.
It has a very straightforward functionality and interface. You just pick a name for the newsletter and embed a code into the website which displays a sign-up form.
Website: http://tinyletter.com/
Streamie is a web-based, totally real-time and open source Twitter client which makes use of the latest web standards such as HTML5 and CSS3.
Website: http://streamie.org/