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All sites that are not actual Q/A sites are not listed.

• SE Chat
• SE Data Explorer - Often referred to as SEDE
• SE Dev Test site
• SE OpenID
• A few redirector sites
  • Ask Ubuntu (You can refer to AU with [ubuntu.se] as a quick shorthand link in comments)
  • MathOverflow
• Web Socket, the socket that powers the realtime page

Strictly speaking, Area 51 is not in the list, but it's easily known and accessible (it's in the top-left dropdown menu of all sites, though).

Other (sub)domains of Stack Overflow:

• SO Chat
• Stack Overflow Blog
• SO Blog Alternative, redirects to above
• Stack Overflow "Facebook" tag - Redirects to SO with a truckload of facebook tags)
• Stack Overflow Jobs - Redirects to SO Talent
• Stack Overflow Careers - Redirects to SO Talent
• Stack Overflow Talent - ↑↑↑
• RADS - Used to be a dedicated redirection site. Closed now (redirects to SO)
• SO Developer Console - Not a test site! Only used by staffs
• DevDays - This has been discontinued.
• SO Email Host
• SO Email Host Alt

• The other Steve

Other primary domains that the Stack Exchange company owns:

• Stack Promos
• SO Business
• StackAuth (The server that enables cross-domain login so you don't have to login separately to SO, SU, SF, AU, etc.)
• Stack Snippets