Rules can be found here.

Candidates are as follows:

#1 AforAmpere's B2ein3cijn4cnrwy5cnq6e/S1c2-ai3acny4anqy5c6ek8 Orthogonoid

#2 Goldtiger997's Snowflakes pseudo-Orthogonoid

#3 2718281828 and AforAmpere's massive RROs starting from here

#4 Additions to the 5S project, especially these ones: (176,1)c/440, 108c/37886 diagonal, (98,97)c/4312

#5 Triangular and ruler replicator + SMOS, 2D replicator with beautiful fractal, 2D replicator firing gliders and 10c/20s, Bizarre rake-plicator

#6 W110 emulation in Codd via unit cells+V2

#7 Omosso's pair-interaction ships

#8 ZombieLife's enormous natural spaceships

#9 2718281828's Dominoplex Orthogonoid

#10 Hactar's 2x2 p2 Life metacell rule

#11 Rule X3VI, the first INT rule to reach 1T objects in C1 on Catagolue

#12 Mahler-rep, a modification of Devore which allows for smaller replicators and computers

#13 B2a/S circuitry

#14 3S1CShip8's c/2^6911+6913 one-cell ship

#15 Non-explosive B1e rules

The nomination period has ended. The voting period will end in two weeks at midnight once all regions of the world have entered 8 May.

EDIT3: deleted EDIT2, what was i thinking?

EDIT4: The voting period has ended! The results can be found here and here.