Photo credit: Robert Mizerek

1. File Qube: File sharing service lets you 2GB create folders with files up to 500MB each
2. Zloop: Create online communities to communicate, organize and share files with your team
3. Qlubb: Create groups and invite people to share calendars, pictures and messages in real-time
4. Gabtastik: Multi-protocol instant messenger for Mac OS X platforms

1. File Qube
   
   File Qube is a file sharing service that anyone can use to share any type of file. Depending if you are registered or not, you can send files up to 500MB and have your personal 2GB space where you can create folders and upload any file in them that you can then share with a public link. Else, if not registered, you can share files up to 150MB, that will be automatically deleted after 30 days. In both cases the service is free to use.
   http://www.fileqube.com/





2. Zloop
   
   Zloop in a collaboration software for creating online communities of people called loops. You can create unlimited loops for an unlimited number of people, where members can interact with each other by organizing projects, sharing files, and having conversation with anyone else, or in one-to-one mode. The service is completely free to use after a simple registration.
   http://zloop.com/





3. Qlubb
   
   Qlubb is an online group networking and communication tool that allows you to create groups and invite as many people as you want to join you. Group members can share any type of information with each other such as schedules, upcoming events, photos, and calendars. Users can also communicate via private and public real-time messages. Qlubb is free to use after you register.
   http://www.qlubb.com/





4. Gabtastik
   
   Gabtastik is a multi-protocol instant messenger for Mac platforms that uses minimal system memory and leaves the screen clean with its personalizable window opacity. It supports GoogleTalk, Facebook chat and Meebo, which means that you can log on services like AIM, Yahoo, and MSN as well. Gabtastik requires Mac OS X to run, and is free to download and use.
   http://www.gabtastik.com/Gabtastik.html