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I have another to add to the list. I've seen and heard occasional rumours crop up from time to time:

Codex Titanicus 2

There is mention of "Codex Titanicus II" in the original Epic Space Marine rulebook from 1989. I've discovered some rumour and hearsay about what else was to be included in Codex Titanicus 2:

Atlas Class Warlord Titan - a testbed Titan used by the Diviso Investigatus for testing new technologies
Legatus Class Warlord Command Titan
Vulcan Class Warlord
Nemesis Class Psi-Titan

Looking at the metal Titan weapons released around the end of 1st edition, it wouldn't be too much of a leap to suppose that the command heads, devotional bell and others could create a command titan. The Nemesis Psi-Titan was sculpted and underwent a limited release in the US.