A factoid about the contestants: how they break out by system.
detail data
SYSTEM #
----------- --
Inform 6 24
Inform 7 19
Twine 6
TADS 2 5
Adventuron 3
custom 2
Inform 5 2
ADRIFT 5 1
Ink 1
multiple 1
The same data including all 105 candidates:
detail data
SYSTEM #
----------- --
Inform 7 33
Inform 6 32
Twine 12
TADS 2 9
Adventuron 5
custom 2
Inform 5 2
multiple 2
Quest 2
ADRIFT 5 1
AGT 1
iffinity 1
Ink 1
TADS 3 1
Undum 1
The various iterations of Inform cover a full 70% of the contestants, and somewhat less (64%) of candidates. The bulk of multiply-nominated candidates were in one of these, though.