There is certainly a profusion of rules in the BSFKL family which have tamed the behaviour of the explosive B/S rules they are based on. Thank you Brian for posting golly rule tables and sample patterns for the ones you find. I have a look at most of them to see what they do, and even managed to find a synthesis for one of your discovered guns - the spiral quad gun in B2S34F067K12478L01368
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x = 30, y = 36, rule = B2S34F067K12478L01368
.A11.A11.A$.2A10.2A10.2A$3A9.3A9.3A$B11.B11.B5$27.2A$26.3A$29.B$26.B
9$27.2A$26.3A$29.B$26.B9$27.2A$26.3A$29.B$26.B!
I'm spending most of my CA time playing with the loop rules and a few different hexagonal neighbourhood rules at the moment, but I'll continue to watch this thread.
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Well, a brief diversion can't hurt. I found an interesting rule based on B35/S2346 - an explosive rule without B2. The rule is B35S2346F01234K23L01234 and it features long lived, small, chaotic patterns which all seem to ultimately die out except for a few still lifes containing only state 1 cells and one oscillator. To my mind there are almost certainly spaceships but I didn't come across any. I haven't figured out how to use the rule tree generator yet, so here is the oscillator in sqc format:
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#B = 0,0,0,1,0,1,0,0,0
#S = 0,0,1,1,1,0,1,0,0
#F = 1,1,1,1,1,0,0,0,0
#K = 0,0,1,1,0,0,0,0,0
#L = 1,1,1,1,1,0,0,0,0
#Rows = 6
#Columns = 6
#L 2.2A$.4A$.4A
I didn't see a similar rule among your collection, but I haven't looked at all of them. Perhaps the MakeIndex scripts could read the rule table from one of the files and include it as a rule name in the generated index.
EDIT: file format