I've written several Legacies and updated a few, so having a hub seems like a good idea.

I'll be updating the table below with links, the asterisk indicates a 1e update rather than a new Legacy.
Ruling → / Optional Death Fate Forces Life Matter Mind Prime Space Spirit Time
Death
Fate Exploratores Felicem Spiritum
Forces Mentats
Life Orphans of Proteus*
Matter Tamers of Stone*
Mind Clavicularius*
Prime The Eclipses; The Unique Collector; Commanders of Ghosts Manus Dei Thaumatech Engineers Commanders of Goetia Commanders of Spirits
Space Binding Coils of Orobouros
Spirit
Time