Open Source or Free Web Apps

Here are some open source or free web apps that you can offer your customers as a sticky app.

• Talk& Write
• Active Collab
• OpenOffice.org
• HyperOffice or Zimbra or BlueTie
• Etelos provides on-demand, customizable Web apps on Your hosting environment
• Etelos CRM in its many faces here
• a pile of CRM apps are available (listed here)
• bulletin boards, forums
• classified ads (be a mini craig's list)
• back-up or document storage

Read more here and here.