
Photo credit: Rodolfo Clix
- A.nnotate: Upload a document or provide a page URL and start adding notes with other people
- NameThis: Use collective intelligence to find or get suggestions for the perfect name for a start-up company
- Netopi: Read and give reviews of any website easily
- SwarmSketch: Draw together with other people and see what masses can create
- A.nnotate

A.nnotate is a web based service that you can use to add notes to documents or web pages. Just upload any PDF, .doc, .ppt, .xls or OpenOffice document, or simply enter a page URL, and start adding notes to it. You can then enter anyone's email address and invite them to give you feedback and collaborate with their notes. Free to use, pro versions available.
http://a.nnotate.com/
- NameThis

NameThis is a collaboration service that start-up companies can use to find a market-ready name. After you submit a request, people have 48 hours to comment and provide you feedback. When the name is selected, $80 dollars of your $99 name fee will be distributed to the first three people, and their supporters. Free to join and suggest.
https://namethis.com/
- Netopi

Netopi is a collaboration tool that lets users give reviews of websites, so that other people can read them and post their own. To start, just paste the URL into the box and, if present, you will be shown all of the reviews that users made of that site. To make your own review, type your name, your comment, give a positive or negative vote, provide tags and, if you want, a list of similar sites. Free to use, no signup required.
http://www.netopi.com/
- SwarmSketch

SwarmSketch is an ongoing online canvas that explores the possibilities of distributed design by the masses. Each week it randomly chooses a popular search term: users can contribute a small amount of line per visit, then they are given the opportunity to vote on the opacity of lines submitted by other users. When the canvas reaches one thousand lines, or one week of life, a new one starts. Free.
http://swarmsketch.com/