string.js is a JavaScript library that adds extra string methods.

String manipulation is a daunting task, especially if you don’t know where to start, and string.js is just about the perfect library for everyday string manipulation tasks.

As everyone — I really mean everyone — who is a JS developer, needs to do some string magic at some time, and sometimes it’s hard to get through the logic and syntax through it.

String.js features several welcome methods for string manipulation:

• Capitalize;
• Collapse Whitespaces;
• Add dashes;
• Determine if a string has some term in it;
• etc.

• Website: http://stringjs.com/

Ospriet is a Twitter-powered audience moderation app for events such as conferences.

Ospriet allows audiences to post and vote on questions that should be submitted for live (or online) events.

Once a user posts a tweet for the event, it gets reposted to the event account, and users can favorite the question, thus making it appear higher in the event page.

Ospriet seems like a great solution for any audience-oriented event; its generated pages are also mobile-compatible, and, it is pertinent to note, elegant-looking.

Check out a recent use example here.

• Website: http://twitter.github.com/ospriet/
• Demo: http://designfromthegut.com/

GreenDroid is a library for making Android UI development easier.

GreenDroid’s main advantages over other similar Android libraries is its concise, powerful set of UI-management features.

The library supports Android 1.6. It might support Android 1.5, but it’s less likely to do so.

GreenDroid is an awe-inspiring solution for making consistent UI’s for Android devices.

• Website: https://github.com/cyrilmottier/GreenDroid
• Demo: http://greendroid.cyrilmottier.com/

Rainbow is a JavaScript library for code highlighting.

It’s a lightweight solution (1.4kb minified), and uses modules for language-dependent code markup.

Rainbow supports a number of languages:

• HTML;
• PHP;
• Pythong;
• JavaScript;
• Ruby;
• etc.

Another important quality of this library is the incredibly easy customization which lets you make up your own highlighting patterns, giving you a complete design freedom.

• Website: http://craig.is/making/rainbows

Ninject is a dependency injector for .NET applications.

Ninject can actually change the way you look at software architecture: the library provides tools that make post-production of your applications a lot easier.

Ninject provides a solution for the perhaps biggest software pitfall of all time — monolithic structure — by allowing you to create loosely coupled, compatible components instead of Hegel-like metaphysical systems that make changing the application painful.

• Website: http://www.ninject.org/

Hogan.js is a templating engine developed at Twitter.

Hogan.js is wrapped around Mustache, and provides a nice interface for the prior.

The library is minuscule at only 2.5 kilobytes. Its functionality is fully based upon Mustache, yet the results are without a doubt quicker.

• Website: http://twitter.github.com/hogan.js/