Great Apps for Small Companies

If you are looking for some apps to run your small company, I figured I would compile a quick list of some of my favourites.  When starting up on a budget, these are some great tools to get you going.  And dont be fooled, the price tag is not the only reason... these are great tools!

User Desktop Apps:

1. Ubuntu - What can i say, i have become very attached to this free OS. Linux is a great OS when it comes to using something robust, fun, and less likely to die from a virus.
2. OpenOffice - Most Micro$oft Office users are very basic users at best.  This free office package comes with spreadsheets, presentation, database, etc.  I would highly recomend taking a good look at it.  It even has GL transitions simular to the ones provided by apple. If you are using office 2003, you may even find moving to OpenOffice easier than moving to Office 2007.
3. Pidgin - Multiplatform instante messanging client for Win, Mac, and lInux.
4. Evolution - Email, Calendar, and Contacts application that works really.. really... well.  It also is compatible with microsoft exchange as well.
5. Wink - Screen capture and training application similar to Macromedia Breeze(?).
   

Multi-User Collaboration Apps:

1. SugarCRM - This is a great little CRM web application.  I was able to get it up and running very easily using vmware and will never go back to spreadsheets again.  You can track accounts, contacts, opportunities, Leads, campaigns, etc.  Very impressive.  perhaps I will write a review and how to....
2. OpenBravo ERP - Now that you used SugarCRM to manage your sales, book an order and track inventory using OpenBravo.  I cant say that I am an ERP expert  by any streach, but for some companies, this looks to be a very promising application.
3. Alfresco - Need to share documents and control file read/write privilages?  This could be the package for you.  From what I can tell it competes  with the likes of Sharepoint.  With webdav access you can also mount the internet based drive as well.  This could come in handy if you want to index the information and make it more searchable on the desktop.
4. gooby - This is a pretty interesting little application.  It allows you to edit documents collabortivley by creating connections to other gooby client users over an encrypted connection.
5. OpenProj - Opensource Project Managment software.

If anyone can think of other great apps to add to the list, please let me know!