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Here you can find the strongest chess engines on Internet. Download archives are free and in 7-Zip format, you can use 7-Zip or WinRAR to extract them. I want to point out that with these NNUE advancements and with the opening books one doesn't have to always use the latest version of an engine, an update every few months is sufficient.
Chess programs:
Stockfish family:
Stockfish+ NEW!
Crystal - Analysis (best choice)
Cfish - Analysis and machines rapid competitions
Blue Marlin - Machines rapid competition
BrainLearn - Machines rapid competition
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.