SMASHDOCs - Web application for easily and quickly writing and reviewing documents within or between enterprises.
Slite - Your company knowledge
CuteFlow - CuteFlow is a web-based document circulation/workflow tool.
Dropbox Paper - A collaborative document-editing service
Hubdoc - Hubdoc gets your key financial docs in one place, automatically.
IntraLinks VIA - Intralinks VIA is a solution for secure and compliant enterprise content collaboration across boundaries.