My love of Heroes of Might & Magic was why I picked up a copy of Age of Wonders in 1999 and loved it, and then of course loved the even more amazing sequel AoW2 in the early 2000s. I still haven't tried the much newer AoW3 yet but it looks pretty bloody good plus they're now working on a scifi version with AoW Planetfall. Presumably to help promote their up and coming game they're now offering Age of Wonders 3 for FREE, and AoW 1-2 for dirt cheap as well.
https://store.steampowered.com/sale/age-of-wonders/
Oh and before anyone asks's, no they're not on sale on GoG sadly.