Straight Up is a vanilla survival server that is trying to be a forever world. The overworld has not been wiped since April 1st 2019 and they say they plan to keep it that way so the map has a lot of history to find.
It is straight survival with no teleport commands like tpa or home. There is no currency system and no factions or economy stuff that changes the vanilla feel.
PvP is allowed and griefing is allowed too since there are no land claims or protected areas. It also has proximity chat with server support for Simple Voice Chat if you want to use the mod.
They say the server is stable and optimized and they use an anticheat that tries to stay out of the way while still stopping exploits.
