Very Confluence like with "Workspaces"
The Editor is mainly "live doc" style
Has some Workflow capabilities but not much - with Tasks
Very, very good UI
Good "macro" fuctionalities
Branding posibilities
Reader accounts (cheaper I expect)
Custom Domain support
Ack of document reading
UK Based Company
Data centers in Nederlands, Iowa and Canada
Very Confluence like with "Spaces"
The Editor is more google like than Confluence like (aka live pages)
Enterprise has a Confluence importer and LDAP/SSO and more.
API should exist, but are not documented
Very promising startup, few developers pose a risk.
Unknown
No Wiki - but and complete suite of files, Office, Talk
Collaborate with XWiki
Very strong suite of Apps
App Store eco-system
Has Confluence Importer (Not free)
Uses "macros" as Confluence
Script executions on page render (Velocity, groovy etc)
Has Jira Macros
App Store eco-system
Has API
Profeessional Support available
Runs on Java, wich is notorious for ressouce allocations
Apps:
Publication Workflow Application
Has Sub-Wikis (for segregation)
France
Currently the installer fails :-(