Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
FileInvite - Stop chasing your clients for documents! Easily request files, documents, forms & signatures from your clients – set a due date and save hours as your requests are returned to you effortlessly.
MicroSIP - MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.
Clinked - White-label Client and Team Workspace
Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
iDeals Virtual Data Room - iDeals Virtual Data Room is a tool that provides secure access to large amount of confidential documents and can view, analyze and collaborate in a protected environment.