RDOSUMB v1.1Ea by Dimension /code/hardware/memory/rumb11ea.zip	30 Jan 1999 (catalog date) 52,607 bytes
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Upper Memory Block manager (not code)

Dimension by Realtech /demos/1995/d/dimensio.zip	29 Jun 1996 (catalog date) 1,049,773 bytes
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Released at event TP94 in the demo division and ranked 05

Sargasso Meera on Monday by Dimension /demos/1995/s/sargasso.zip	05 Mar 1998 (catalog date) 58,781 bytes
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I suspect they lied about the release date - could've been made in 1996?

Dimension by Gods /demos/1998/d/dimen.zip	19 May 1998 (catalog date) 4,774,141 bytes
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Released at event TG98 in the demo division and ranked 01 ,3dfx opt.,GUS/SB/PAS,