There are many more than the ones listed, but this will give you a starting point if you are in Europe. Many Europeans successfully use US based platforms but UK based ones are more likely to have timely technical support as well as orientation training and advice on recruitment etc.
VisionsLive: UK Based. Focus groups and depths, bulletin boards, remote screen view www.visionslive.com To see a demo of how the focus group platform works, click here: http://client.visionslive.com/demos/videos/full/
Chat Group: UK based platform for synchronous focus groups. www.chatcloud.co.uk Download ChatGroup Brochure.
Liveminds: ”An online qual research application” Liveminds.co.uk
MrQual - UK based. Online bulletin board groups, depth interviews and blogs. http://mrqual.com/
DubStudio - UK based. Blogs, bulletin boards, online research community and co-creation platform http://www.dubstudios.com/
The Click Room UK based – a cool virtual group facility for younger people http://www.theclickroom.com/
The Thinking Shed - UK based, originally for pre and post tasking, now also for forums, mark up studies,etc – and in a range of languages. http://www.thethinkingshed.co.uk/index.html
TQual bulletin board – links with TPoll and their panel if you wish. UK Based http://www.tpoll.com/content/Tqual
Kwalitools - based in Europe, synchronous webcam platform. http://www.kwalitools.com/ to see a demo video: Kwalistudio Qualitative Methodology
QualVu: US webcam based bulletin board – demo here: http://www.qualvu.com/?src=aug
Revelation Global US-based. Tools for immersive online research projects. Now with Helping Hands project management and iPhone app. http://www.revelationglobal.com/explore/introducing-revelation-project
Blog Nog US based, from Accelerant Research.https://www.blognogresearch.com/ Download Blognog brochure here
iTracks US based – online qual, and social media monitoring http://www.itracks.com/ Facebook application for Talk Now panel in North America.
iModerate - US based. Online one on one chat sessions, integrated into surveys or standalone as depth interviews. Also GutCheck, a 30 min DIY IDI product. http://www.imoderate.com/