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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:
Crystal - Analysis (best choice)
Stockfish Polyglot - Machines rapid competitions and analysis
Cfish - Analysis and machines rapid competitions
Blue Marlin - Machines rapid competition
BrainLearn - Machines rapid competition
Swordfish - Machines rapid competitions (updated)
CorChess - Correspondence chess or machines rapid competitions (updated)
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. On my main computer, Stockfish Polyglot and CorChess solve it at depth of 42 plies. Lc0 is unable to solve it after 5 minutes of analysis, nor Cfish, nor the new SugaR ICCF at depth of 45 plies(!). Komodo once solved it, but ironically Dragon 3 doesn't it anymore after 5 minutes.