Photo credit: Vacuum3d

1. Jangl: Web-based VoIP tool allows you to call people without knowing their number or giving yours
2. EQO Mobile: Mobile instant messenger and VoIP software allows you to talk and chat from your mobile phone
3. WhoDoes: Web-based project management system lets you manage activities and assign tasks
4. Purplenova: File sharing software allows you to share your files directly from your computer with a public URL

1. Jangl
   
   
   
   Jangl is is a web-based VoIP tool that allows you to call other people without knowing their number. All you have to do is enter someone's email and you will be provided with a Jangl number: if they allow it, your call will be forwarded to their phone and you can talk live or, if they don't allow it, you can leave them a voicemail, which will be sent via email. Free beta.
   
   http://jangl.com/





2. EQO Mobile
   
   EQO is a mobile instant messenger and VoIP software which runs on Java compatible phones. It is complete communication suite, in which you can import your phone address book, that allows you to make VOIP calls at low rates(http://www.eqo.com/rates.php), IM across networks (MSN, YAHOO, AIM, GoogleTalk, ICQ, Jabber), and text message. Free to use.
   http://www.eqo.com/





3. WhoDoes
   
   WhoDoes is a web-based project management system that lets you manage your activities and share information with your team. Its main features are an online calendar to plan activities, a task manager to assign tasks to your team's memebers and a file uploader to share documents with your colleagues. It is still in beta and free to use.
   http://whodo.es/





4. Purplenova
   
   Purplenova is a downloadable software that you can use to share your files with anyone. After you select your files with a click, they automatically get a public URL that you can share with other people to share those files. It doesn't matter how large a file is, in fact users can stream it off your computer through any browser with no need for you to upload it on a web server. Free beta.
   http://www.purplenova.com/