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Chess engines
Here you can find the strongest chess engines on Internet.
Stockfish family:
Crystal - Analysis (best choice)
Cfish - Analysis and machines rapid competitions
Blue Marlin - Machines rapid competition
BrainLearn - Machines rapid competition (updated)
Swordfish - Machines rapid competitions
CorChess - Correspondence chess or machines rapid competitions
Coming next:
Lc0
Arasan
How to know if a chess engine is good?
If your engine solves fast this position 8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - - 0 0

(solution: White moves Nf6+! and wins) then it's a good one.
Note: with the recent neural network update and with a good opening book, one doesn't have anymore to get the latest version of an UCI chess program; an update every few months is sufficient.