About Exponenciel Exponenciel has been the leader in Act! add-ons development since 2001. Exponenciel offers more than 100 add-ons for different versions of Act!. More than any other Act! add-on development firm. We have also developed hundreds of custom add-ons for Act! for specific customer needs over the years. For sales inquiries, call 514-587-6067. For technical support, use this contact form. Check our range of Act! add-ons, among which: MailChimp Plug-in for Act! Automatic Field Calculations AutoNumbers for Act! records Skype Plug-in for Act! Excel Quote-Invoice Maker II Advanced Excel Templates II Advanced Dropdown Lists Act! Listview Manager We also have free Act! add-ons.