Jarallax is an open-source javascript library which makes adjusting css based on interaction easy. With Jarallax it's easy to create a parallax scrolling website.
Did you know that by default LINQ to SQL defines your connection string in more than one place if you define your LINQ to SQL classes out from a web app, such as a data access layer class library?
"Responsive elements makes it possible for any element to adapt and respond to the area they occupy. It's a tiny javascript library that you can drop into your projects today."
EditableGrid is an open source Javascript library aimed at turning HTML tables into advanced editable components. It focuses on simplicity: only a few lines of code are required to get your first table up and running.
NuPack is a free, open source developer focused package management system for the .NET platform intent on simplifying the process of incorporating third party libraries into a .NET application during development.
" Sliderman.js is a standalone javascript library for sliding images. The main feature of Sliderman.js is multiple unique effects which can be combined together. "
Zepto.js is a minimalist JavaScript framework for mobile WebKit browsers, with a jQuery-compatible syntax.
The goal: a 2k library that handles most basic drudge work with a nice API so you can concentrate on getting stuff done.
jQuery Bubble Popup is a plugin to display smart, animated & shadowed, "bubble" popups or tooltips with few lines of code in jQuery. The plugin support HTML5 and it is fully compatible with IE, Firefox, Chrome, Opera and Safari. It needs jQuery v.1.4.2 to run, the fastest and concise JavaScript Library.
This is an agile HTML parser that builds a read/write DOM and supports plain XPATH or XSLT (you actually don't HAVE to understand XPATH nor XSLT to use it, don't worry...). It is a .NET code library that allows you to parse "out of the web" HTML files. The parser is very tolerant with "real world" malformed HTML. The object model is very similar to what proposes System.Xml, but for HTML documents (or streams).
Downloadify is a tiny JavaScript + Flash library that enables the generation and saving of files on the fly, in the browser, without server interaction.