Below is a list of all the sub-topics and sub-sub-topics contained under the Sophonts header in the Encyclopaedia Galactica.

Modosophonts
Aioid
Baseline Human
Bioborg
Bionoid
Cyborg
Nanocyborg,Nanoborg
Near-Baseline Human
Neogen
Neumann
Parasapient A-life
Provolve
Rianth
Sapient Structures
Sentient Ships
Splice
Superior
Sybont
Tweak
Uploads, Copies, and Virtuals
Vec
Xenoprovolve
Xenosplice
Xenosyn

Presapients

Transapients
Animin
Animin Power
Hyperturing
Postbiont, Po

Xenosophonts
Cthonids
J'Ta'ush
Jeepers of Mik's Planet
Kemmerer
Limners
Meistersingers
Menexenes
Mucoid Empire
Muuh
Paulans
Silent Ones
Singers
The Soft Ones
To'ul'hs
Wayfarers