It is powered by the Ajax.org platform + makes use of HTML5, node.js, socket.io and many other projects.
The application has a pretty fast text editor with bundled syntax highlighting support for JS, HTML, CSS and mixed modes.
Cloud9 IDE has integrated debuggers for node.js and Google Chrome which can be started, paused and stopped from the IDE.
Using WebDAV, it can connect to remote workspaces too and has a plugin system for improving it further (already has several bundled plugins).
P.S. The application is still in early development stages, can be a little buggy but improved continiously.
Requirements: Git 1.7+ (for Windows installations)
Unify is a software, powered by Deutsche Telekom, which provides a common API developing cross-platform applications that will look and feel like native ones.
The code can be re-used between platforms and supported ones are iOS, Android, WebOS, Windows and Mac OS.
Unify also eliminates the traditional limitations of the web browser and can detect the current geo location, access the file system, etc.
Compatibility: iOS, Android, WebOS, Windows and Mac OS
Data URIs, which is a way of using data in-line in web pages, is a great method for minimizing HTTP requests and speeding up websites.
The common usage is simply encoding data (mostly background-images) in Base 64 and including it to the stylesheets.
Spritebaker is a free web application which automates this process for you.
Just mention the URL of the CSS file, it will search for the background-images + fonts (non-local ones) and create a new stylesheet with these stuff converted to Data URIs.
However, don't forget that Data URIs usage isn't perfect yet like the CSS file will grow (you must turn on gzip-compression) or <IE8 browsers will be incompatible. It'll be a good idea to check the suggestions by Spritebaker.
Bazaar is a free version control system for tracking project history over time and collaborating easily with other team members.
Whether you are a single developer or a group of developers (at the same location or working remotely) Bazaar does the job well.
It is an easy to learn and use system which can work on all major OSs. Also, compared to Git and Mercurial, it supports bound branches (an easier and safer way of implementing a centralized workflow).
There are many applications that can work with Bazaar like Loggerhead, a web interface for it or several IDE integrations.
Compatibility: All major OSs
Once included in web pages, rest is done automatically.
And, if there are multiple JS frameworks inserted in the web page, Selectivizr chooses the most suitable one for the job.
Compatibility: IE 6-8
It is free for everyone and works by simply using the URLs mentioned (original or the minimized versions) as the script tag URLs.
Compared to the popular Google Libraries API, it hosts a much more number of libraries including many jQuery plugins, visualization or the ones for markup.
The only downside for now is that, there is only jQuery as a JS framework and hopefully, it'll start hosting others soon.
WebMatrix is a free kit by Microsoft which includes everything you need for creating websites on Windows.
The application itself enables you to control almost everything from a single interface like the code and database editor, web site and server management, search optimization, FTP publishing, and more.
The kit comes with:
- IIS Developer Express (a development Web server)
- ASP.NET (a Web framework)
- SQL Server Compact (an embedded database)
and with just a click, you can install open source applications like WordPress, Drupal, DotNetNuke, etc.
WebMatrix has also some nice features like the ability to run a SEO report or monitor real-time Web requests and responses to track down problems right at the source.
OneWay is a tiny, free and open source Mac OS X application for instantly uploading any file/folder.
It can upload data to FTP, SFTP or Amazon S3 directly from your Finder.
You can save the frequently used upload locations to the context menu (project-backups, personal-backups, etc) and send the files with a ctrl+click.
OneWay is very functional for web designers/developers while live-testing a web project as it usually requires frequent updates or easily backing up project files.
Compatibility: Mac OS X
Show Slow is an open source tool (and, optionally, a free web-based service) for monitoring website performance metrics over time.
It simply collects the results from YSlow and Page Speed rankings and graphs them to show you how various changes to the website can affect the performance.
And, it can do this regularly to help you see the improvements done within time.
Requirements: Apache or nginx server, MySQL
It respects MVC, views can be designed in HTML5/CSS3 and then you can bind them to your Ruby models.
There's no request/response cycle. Any changes in models automatically get reflected in the view.
Applications built with Bowline currently works in Mac OS X + Linux and Windows support is on the way.
Compatibility: Linux and Mac OS X (Windows is coming soon)