Photo credit: Juri

1. Meebo for Firefox: Firefox add-in allows you to have all your IM buddies inside your sidebar
2. SpinXpress: Free application lets you transfer files and collaborate with with a group of people

3. WiseMapping: Create mind-maps, invite people, and let them edit your maps
4. Microsoft Listas: Create, edit and share lists, documents, notes, and more with your team

1. Meebo for Firefox
   
   Meebo for Firefox is an add-on for the popular browser that allows you to connect to mutiple IM networks using Meebo. Supporting Msn, GTalk, Yahoo, Icq, Aim, and Jabber, it enables you to group all of your buddies inside your Firefox sidebar, and to chat with them while you're browsing. You can drag-and-drop links and images from web pages right onto your friends, share files, and get visual notifications for events. Free to download and use.
   https://addons.mozilla.org/...





2. SpinXpress
   
   SpinXpress is a free application for file sharing, collaboration and publishing. It allows you to transfer and share files with no limits in size. It includes personal discussion boards, wikis and simple online publishing functions. Every file that you add will be available to the group, with no need for you to be online. Needs registration. Free to download and use.
   http://www.spinxpress.com/





3. WiseMapping
   
   WiseMapping is an online mind-mapping software that enables you to create mind maps and share them with your team. It uses SVG/VML instead of Flash or AJAX so you can create online mind-maps that are viewable in more browsers. You can invite other people to edit the map and, when it's finished, you can export it in multiple formats or publish it online. Still in private beta, it is free to use.
   http://www.wisemapping.com/





4. Microsoft Listas
   
   Listas is a tool for the creation, management and sharing of lists, notes, documents, and more. All lists are private by default, but you can easily invite people and grant them access to read/write on your list, and use it as a wiki page for brainstorming, document editing, manage projects, and more. All you need is a Windows Live ID. Free to use.
   http://listas.labs.live.com/