DreamFace - Framework for creating personalized Web apps.
Organic Incentive - Tools for creating viral widgets with a drag-and-drop interface.
dbFLEX - On-demand business application development platform.
app2you - Online tool for creating custom Web applications.
Qrimp - An affordable database platform that builds applications around your data (which you can upload in an Excel spreadsheet).
Lightspoke - Application builder with drag-and-drop application design, dynamic filtering and sorting, and a true relational database backend.
Tersus - Visual application creator with no coding or scripting required.
Qt - Cross-platform application framework that lets you develop applications and user interfaces simultaneously.
Code Snippets, Search Engines and Repositories
byteMyCode - Code snippet search engine.
Snipplr - A code repository where you can store and organize all of your code snippets.
ErrorKey - Error code search engine.
findJAR.com - JAR file search engine.
github - Code repository that includes both public and private repositories (the private repositories are only accessibly through SSH and SSL, providing extra security for your code).
merobase - Search engine to find components for your development projects.
Codebase - Code repository, ticketing support and deployment tracking app.
CONFiles - Online storage and sharing for your configuration files.
CodeSnippets - Public source code repository that also allows users to keep private repositories.
GWT-Ext - Free, downloadable widget library.
Development Environments, Platforms and Frameworks
SocialGO - A social networking hosting platform that includes messaging, video chat, custom member profiles, photo sharing, blogging and more.
Pringo - Social networking platform with a variety of features, including video and MP3 support, galleries, groups, podcasting, and more.
slinkset - Hosted platform for creating custom social news sites.
iWidgets - A turnkey “Social Syndication Platform” that allows you to syndicate your content to social networks and portals.
WackWall - A hosted social networking platform.
WhiteLabelDating.com - Platform for creating your own branded dating, social networking or community site.
ONEsite - Social networking platform and hosting that includes blogging, photo & video galleries, rating & tagging, message boards, private messages and more.
jinity - Free social networking platform and hosting that includes message boards, chat, groups, journals, polls, news, and more.
Magnify.net - Website video platform with a full suite of media tools.
ShoutEm - Microblogging social networking platform and hosting.
Soceeo - Social networking platform and hosting that includes file sharing, news, polls and more.
Swift - A mobile website creator that includes multiple design options, RSS feed support, multimedia support and more.
SnappVille - Social networking platform that includes groups, blogging tools, instant messaging, and more.
Ning - Social networking platform and hosting that includes custom branding, member profiles, event listings, and even Facebook integration.
mixxt - Social networking platform that includes events, forums and more.
zembly - A platform for creating social apps. Currently in private beta.
Yuku - Community platform and hosting solution that is customizable and has powerful administration tools.
SocialEngine - PHP-based social networking platform that features multi-part profiles, subnetworks, search-friendly URLs, blogs, groups, and more.
Cappuccino - Open source framework for creating desktop-quality Web apps.
Jaws - A user-friendly framework and CMS for dynamic Web sites.
General Development Tools
Tabifier - A tool that automatically puts the proper indents in your source code.
Sms2do - A free tool to demonstrate and evaluate SMS applications.
Jitterbit - Open source integration solution that improves scalability and performance.
Bitizer - Conversion tool for Binary, Decimal, Hex, Base 36 and ASCII.
thmbnl - Show thumbnail images of pages being linked to from your site.
ID Selector - OpenID utility that helps increase logins by helping your users memorize their OpenID.
consoleFISH - Free Web-based SSH server access.
form site - Web form builder and hosting that offers free and paid plans.
99Polls - Create custom surveys and polls to get feedback on your site.
Warehouse - Subversion browser with multiple repository support and fine grain permissions settings.
rendur 2.1 - Sandbox app that renders your page as you code.
Languify - Translation management system for dealing with multiple language support in agile software projects.
ROR Sitemap Generator - As the name says, this site creates a ROR format sitemap with up to 1,000 URLs for your website.
MicroMaps - Create interactive maps (geographic, facility, or others) to put on your websites.
Newsfeed Maker - Create a custom newsfeed to include on your blog or website.
WriteMaps - Online sitemap builder.
Project Kenai - Free hosting of open source projects and code that includes collaboration and issue tracking.
Launch Splash - Free tool to create a pre-launch page to put on your website.
Browser Shell - Browser-based SSH tool.
foigo - Create customizable forms, surveys and databases.
AggData - Premade lists for your development projects.
SnapCasa - Free, easy to implement website thumbnail provider.
Versionshelf - Secure subversion repository that includes one-click backups.
Mashups and APIs
The Echo Nest - APIs for a host of different music-related development services (including in-depth artist information and music recommendations).
Zeep Mobile - An API to add text messaging to your site.
Clickatell - An SMS gateway that lets your website send messages worldwide through a number of different connection options.
Nonoba - A multiplayer API for online game developers.
Zong - Mobile payment platform with a developer API.
Web Shots Pro - API for developers to add website screenshots to their apps.
Pushpin - Easy to use online mapping API that allows for thousands of markers (pushpins) and other advanced features.
Datamash - Create widgets and mashups for your site with information anywhere on the Web.
Spicy Pipes - Mashup builder.
Reference and General Resources
COfundOS - Platform for discussing open-source software ideas and finding funding.
Mac Yenta - Social network for independent Mac developers.
CorkDump - An online cork board for keeping commonly used resources (code snippets, CSS, Flash, etc.) handy.
All Developers Network - Social news network for developers.
CodePlex - Open source project hosting site from Microsoft.
UnmatchList - A resource directory for developers and designers.
developerAnalytics - Social media ratings and report services that help you find the hottest up and coming social media applications before they get big, find out who’s making the most money, how your competition is doing and more.
CollabFinder - A place for designers and developers to collaborate.
Testing, Monitoring, Bug Tracking and Project Management
CloudStatus - Independent monitoring of some of the Web’s most popular cloud services.
BetaBitz - A site that helps you solicit beta testers and increase the visibility of your site.
observu - Free website and server monitoring service.
UserFix - Report bugs or request features for any website.
OctaGate SiteTimer - A tool to see how long it takes your site to load.
Cuzillion - Simple page testing and checking app.
Mob4Hire - Crowdsource your mobile application testing.
Beanstalk - Hosted system that makes it easy to setup, browse, and track Subversion, including built-in integration with sites like Basecamp and Campfire.
BUGtrack - Project management and bug tracking.
UserZoom - User experience testing platform.
devunity - This used to be betabug, but has undergone a facelift and is now a social development platform.
BuiltWith - Technical analysis and SEO information for any website.
fixx - Issue and bug tracking software that includes filtering, a mobile interface, and collaboration.
BugWiki - Simplified bug tracking application.
litmus - Web-based testing app for checking your designs across different browsers.
Bugtagger - Bug tracking with tagging capabilities for reviewing how your bugs are related (even between projects).
FEED Validator - Validate your Atom, RSS and KML feeds.
pastebin - Debugging tool that allows you to work collaboratively on solving issues.
JUnit.org - A testing framework for writing and performing automated testing programs.
Ruby & Ruby on Rails Resources & Tools
Open Source Rails - A showcase of open source Ruby on Rails sites.
Exceptional - Exceptional tracking and management utility for Rails apps.
TuneUp - Check the performance of your applications using this Rails plugin.
heroku - Ruby on Rails platform that requires no setup or configuration, allows coding right in your browser, and has elastic scaling.
RSpec 1.1.8 - Development framework for Ruby that includes a Scenario Framework and a Code Example Framework.
Lovd By Less - An open-source, Ruby on Rails social networking platform.
Merb - A Ruby framework that includes comprehensive features.
Camping - A Ruby on Rails microframework.
frevvo - Ajax form creator that includes full XML support and drag and drop controls.
AjaxDaddy - Ajax application demo showcase.
WaveMaker - A visual, open-source Ajax WYSIWYG editor.
Bungee Connect - Ajax Web app platform that is cross-browser compatible and instantly scalable.
Spring - Enterprise Java application framework that aims to increase development productivity and application quality.
PHP Resources & Tools
Flow3 - A PHP framework initially developed as the foundation for TYPO3 5.0, but that can be used independently.
Prado - A component-based programming framework for PHP 5 that is object-oriented and event-driven.
Perl Resources & Tools
Mason - A Web site development engine that’s Perl-based and includes tools to handle debugging, templating, and more.
Flash Resources & Tools
OpenLaszlo - A rich Internet platform that lets you compile to both Flash and DHTML while only writing once.
Python Resources & Tools
GTK+ - A toolkit for creating GUIs that works with Python among others.
Wing IDE - A professional Python development environment that offers a free 30-day trial.
Cheetah - An open source, Python-based template engine and code generation tool.
Last year we did a post on Web development tools.