SOFTWARE 2.0 - Update

The list below is a container for all kinds of enabling softwares. Many of them are open source. Probably the most interesting ones are the frameworks, platforms and libraries for typical 2.0-stuff (and in that niche this list is certainly NOT comprehensive - so tips are more than welcome).

123businesscards - Design & print your business cards on demand
301url - Shorten your url
37signals* - Basecamp, Backpack, Writeboard, Ta-da List
Abaqueinside - Catalogue ware
Abouturl - Aggregates many site tests
Activecollab - Collaboration & project management tool (free)
Ajax - Mozilla developer community
Ajaxload - Generates animated Ajax load gifs
Ajaxpaterns - Ajax developers portal
Ajaxshowcase - Aggregates Ajax applications
Amberjack - Create & publish site tours
Apollo - Adobe RIA development platform
Applian - Capture streaming audio & video
Asterisk* - Open source phone system (free)
Ataja - Shorten your url
Azareus - Distribute bandwidth & share content
Backbase* - Ajax applications
Bigcartel - Web stores for creative people
Biginjapan - Social media tools
Blotter - Graph your blog's popularity
Bluepulse - Internet 2 cell phone
Bordee - Instantly create message board for your page
Broadramp - Multimedia management solutions
Builtsmarter - Modular site (re)construction software
Caspio - Web-based database solutions
Celumimagine - Media management tool
Cl1p.net - Copy & paste between computers
Clearspace - Enterprise collaboration solution
Click2zap - Remove parts of web page before print out
Clicmobile - Mobile social software
Coda** - One page web development
Codase - Search for & share code
Cogenz - Intra-company social bookmarking
Coghead - Create & share web-based business apps
Connectbeam - Intranet community solution
Contactify - Create & publish contact form (without revealing your email address)
Contactnetworks - Enterprise relationship management solutions
Cordance - Dataweb technologies
Covenanteyes - Anti-porn filter for… you
Create-ringtone - Create & send ringtones, wallpapers, videos etc. to your mobile phone
Creatingonline - Design & image editing toolbox
Crispynews - Build your own Digg for free
Crossloop - Share your screen
Cspace - Platform for P2P communications
Cyberdummy - Share code
Dapper** - API generator
Deligio~ - Discover, manage & share your downloads
Diffbot - Get alerts on websites' changes
Digitalbycicle - Media distribution solutions
Django - Python apps
Dnsstuff* - Get a full technical report on your server status
Dojo - Share JS tools
Domaintools* - Excellent toolset for everything related to domains
Dream-recorder - Record YOU while you sleep
Dutchpipe~ - Create multi-user environments
Dvdidle - Work around DVD region codes & css
Easyutil - Api for recommendations
Echosign - E-signature automation solution
Effectivebrand - Create your own community toolbar
E-junkie - Solve & outsource all online sales
Elfurl - Make long url's short
Etelos - Try & buy on demand Web 2.0 apps
Eventwax - Organize, publish & manage events
Experticity - Solutions for live agents, on-screen and on-demand
Feedforall - RSS script directory
Filenice - File browser (client)
Finsock - web-based sme business software
Fiveruns - Monitor & maintain your systems
Floorplanner~ - Design your floorplan online
Flyingcart - Set up an online shop
Formspring - Create & publish forms & surveys
Freewebs - Create free website, share, sell
Funambol - Mobile OS project
Gettomas - Online artist management tool
Googleapps - Offer email, IM and calendar tools to your site's visitors
Heywatch - Encode your video in any format
Hippo~ - Open source cms
Homeportals - Mix, modify & share your web pages
Html2pdf - Render any web page to pdf
Iiproperty - Manage your properties
Infogami - Create websites
Intronetworks - Social networking solutions
Jive - Enterprise forum solution
JS-Kit - Add comment features to your website
Jumptap - Mobile search solutions
Kickapps - Adds 2.0-things and video to your website
Kittenauth - Protection against spambots
Koral - Content & document management system
Krugle - Search open source software
Laszlo - Web 2.0 software
Lessaccounting - Simple SME bookkeeping & sales management solution
Lifeio - All to the people (stealth)
Lyceum - Enterprise multi-user blogging
Majikwidget - Customize & integrate widgets on your blog
Mashcodes - Get social networking tools (hosted by Mashable)
Medio - Mobile search & recommendation engine
Mendix*~ - Semantic application development
Meta - 2.0 forum solution
Metadot - Build your own website, intranet, portal
Mfoundry - Develop & deploy mobile apps, rapido
Mmoguildsites - Manage your MMORPG clan's hosting & community needs
Mobilecomplete - Test your mobile apps on all devices
Mobiledistillery - Port mobile Java apps to 550 phones, rapido
Mobio - Lean mobile lifestyle apps & content
Mochikit - Suite of JS libraries
Mojopac - Run any app on any device
Montastic - Monitor your website
Movenetworks - Measure & analyse each video viewer experience
Mozilla - Browser add-ons & mash-ups
M-spatial - Mobile local search solutions
Musicarsenal - Music business management tools
Navteq - Global mapping dbase & technologies
Nellymoser - Mobile content delivery solutions
Nexidia - Transform av data into business intelligence
Ning - Create social apps
Noovo - Create a website & share with other users
Notlong - Shorten your URL
Ohloh - Search indexed open source projects
Openfire - Enterprise VoiP and chat solutions
Openrico - Open source Java library
Openwave - Adaptive mobile suite for content, communications and context solutions
Opsource - SaaS enablement and delivery platform
Orbeon - Create Ajax forms
Oszone - Share code
Oz - Mobile IM, email & social networking solutions
Palary - Ajax browser
Picostation - Create & share your phone cam videos
Pingerati - Share your microformats
Plogger - Open source photo gallery system
Pluck - Social media solutions
Prismastar - Ecommerce solutions
Processing - Share code for imaging, animations, sound
Projectip - Recognizes anything on your computer
Promptu - Voice based search for all media
Prospero - White label community software
Proto - Create desktop mash-ups
Prototype - JS framework
Pubet - P2P filesharing (client)
Qliktech - Business performance & intelligence solutions
Qooxdoo - Javascript GUI toolkit
Radiotaleripple - Analyse your podcast's stats
Radrails - Develop Ruby on Rails apps
Realtimematrix - Solution to personalize your content for any device
Responsetek - Multichannel customer experience management solution
Roxio - Try out free media apps
Rubyonrails* - Web development framework
Safemail* - Create an uncrawlable image of your email address
Sampa - Build a website
Schooltool - School calendar & info system
Schoopy - Classroom organizer & site hosting
Scrapblog - Scrap, blog & share
Screentonic - Mobile advertising platform
Scriptaculous - Javascript libraries 2.0 style
Scriptmimic - Find or publish & share scripts
Sidewalk - Create Ajax forms
Simile - Semantic interoperability of metadata and information tools
Simplelog - Blog application
Simpleseating - Seating tool
Site24x7 - Monitor your site's performance
Sitekreator* - Build, publish & host websites
Sitevista - Test your website
Skyhook - Wi-fi positioning
Smblive - Share all business applications
Snipperoo - Add, remove & manage widgets
Speedtest* - Check your ISP's speed
Splashdata - Mobile tools for media, payments, shopping…
Sprajax - Security for Ajax
Stargazer - Free web-based tools for families & charities
Starhome~ - Mobile roaming solutions
Star-P - Parallel computing for scientists
Stellent - Enterprise blogging & wiki
Suitetwo - 2.0 toolset for enterprises
Surfulater - Collect, save, republish & manage web info
Swarmteams* - Solutions to set up & manage mobile One2- or Many2Many community communications
Swik - Search for open source software
Synthasite - Collaborate on site development
Tapuxmobile* - Mobile fun & community content & apps
Telepo - Fixed to mobile convergence solutions
Teqlo - Mash-up APIs and widgets
Textsnippets - Share code
Thnlnk - Semantic URL shortener
Traction - Enterprise multi-user blogging
Turbogears - Rapid development framework
Twistedpair - IP-based group communications solutions
Uize** - Java API Library
Ulocate - Mobile location based services solutions
Urlx - Shorten your URL
Visto - Mobile Office solutions for operators
Visualcomplexity - Visualize complexity
Vitrue - White labeled advertising video solutions
Vivox - Solutions for communities, communications, games
Vyatta - Open source router & firewall solution
Waml - Open source framework for WAML apps (give this guy a hand!)
Watchmouse~ - Site & server monitoring services
Webgui - CMS
Weborb - Build, deploy & host rich client apps
Webripper - Rip files from sites
Websitewatcher - Monitor sites for updates and changes
Weebly - Free web creation tools
Whosamongus - Count your actual site visitors
Widsets - Create mobile widgets
Wildapricot - CMS with lots of 2.0 for not-for-profit clubs etc.
Wordcast - Host, manage, measure & monetize podcasting
Workday - web-based ERP solutions
Wyacracker - Build your own widgets
Xmetal - XML authoring suite with 6 applications
Yahoodevelopernetwork - Javascript developer centre
Yahoopipes** - Remix feeds, create mash-ups & share them
Zamzar* - Convert your files online
Zeosoft - Personal mobile webserver application
Zohocreator - Create & share applications

Italic = new. Update 061224, 070119, 070303, 070517 (corrected 070527).