Photo credit: Paulo Correa

1. Browzmi: Browse the web in real-time with other people while chatting with them
2. Wik.is: Start your own wiki page and invite as many people as you want to contribute
3. Mixin: Post your daily activities, mix them with other people's, and set up appointments
4. Zoho Planner: Create pages, to-do lists, assignments and notes, and share them with your team

1. Browzmi
   
   Browzmi is a social surfing application that integrates instant messaging. After you log-in into Browzmi, you can invite people from your instant messengers account and start chatting with them, as well as viewing the pages they are currently browsing, and look at the together in real time. You can watch videos, flick through pictures, and browse every website together while you instant message. Free to use.
   http://www.browzmi.com/







2. Wik.is
   
   Wik.is si a free wiki hosting platform that anyone can use to create wiki pages. Without even registering, you can enter any name for your new wiki and create it with a single click. You can then invite an unlimited number of people who can create pages, share files with a total sharing space of 100MB, integrate video and image sharing websites, as well as search engines, and more. A pro version with 10 GB of storage space is also available at $99/year.
   http://wik.is/






3. Mixin
   
   Mixin is a shared calendar application that lets people share their activities with others. You can post any activity to your calendar by SMS, email, IM or Twitter and, mixing it with other people's calendars, you'll be able to schedule appointments and meetings. Plus, you can also discuss together into the message board of your group. Free to use.
   http://www.mixin.com/






4. Zoho Planner
   
   Zoho Planner is an online organizer application for you to plan projects and tasks. You can create pages with attaches files, to-dos lists, assignments, notes, and start sharing them with people: you can share any page in public or private mode, by pasting people's email, granting them the ability to read/edit the page. Free to use, Zoho account required.
   http://planner.zoho.com/