X-Copy Professional was originally programmed by Frank Neuhaus and Hans Georg Berg for Cachet Software in 1991. It's likely the most used software ever for the Amiga. The iconic "takk-takk-takk-GRRR-boingggg!" sound at the 0:15 mark lives rent free in my head forever.

"We've advanced a tech level!" Popular belief credits Dune II as the first major RTS, and it certainly launched the genre into the spotlight with near perfect reviews and massive commercial success. However, other RTS games predated it. One was Mega-Lo-Mania, developed by Sensible Software and released in 1991 for the Amiga and Atari ST. You control one of four gods: Scarlet (red), Oberon (yellow), Caesar (green), or Madcap (blue), trying to conquer 28 islands across eras from 9500 BC to 2001 AD, each with new units and structures. You begin with 100 men per island, mine resources, research tech trees to unlock units from primitive cavemen to powerful tanks and lasers. Though smaller in scope than Dune II, it helped pave the way for the genre. The digitized speech and pixelated beauty still holds up if you ask me. Not bad for a 35 year old game.