Pirates Gold! Plus (the classic) - 70% discount, 1.79$
Pirates! Gold Plus -70% on GOG.com
Corsairs Gold - 60% discount, 2.39$
Corsairs Gold -60% on GOG.com
Blood and Gold: Carribean - 60% discount, 7.99$
Blood & Gold: Caribbean! -60% on GOG.com
ManO'War: Corsair (Warhammer Fantasy Pirate themed game) - 10% discount, 26.99$
Man O’ War: Corsair -10% on GOG.com
So if any of them is on your wishlist, go get them.
Keep in mind that ManO'War is still in early access, so what you get is the beta, a beta that will be upgraded to the full game, once the title is actually released.
P.S.: the sale is available for 3 more days.