Vaulted Vanilla is an SMP that tries to feel like modded Minecraft but you still join with a normal vanilla client.
The world generation is heavily changed with new terrain and big structures to explore. The dimensions are overhauled too using Terralith Incendium so the overworld and the Nether feel way more interesting.
It also has quality of life plugins and data packs plus waystones and proximity voice chat. There are custom items and SlimeFun4 for more stuff to do. The server has a subtle economy and fishing competitions to keep survival from getting boring.
It is on version 1.21+ and crossplay is enabled. They are a newer community and they want feedback while everyone builds it up together.
Modded Feel Vanilla SMP Worldgen

GG.MINEWIND.NET New Server IPThe Chum Bucket Vanilla+ Modded SMP

This server is called The Chum Bucket and it is a modded Java SMP that still feels like normal Minecraft. It runs on version 1.20.1 with Forge and it aims for a vanilla plus style. That means the game is deeper and smoother but it still looks and plays like regular Minecraft.
There are around 160 mods but it is not a crazy kitchen sink pack. The mods are mostly for quality of life, better world generation, more exploration and building stuff and performance. It is not super tech heavy and it is not pay to win.
The world is meant to last a long time so you can build big projects and explore at your own pace. The server is good for builders and explorers who want chill vibes and clean modded survival. If you want info about the modpack or have questions you can ask the owner in comments or DMs.
GG.MINEWIND.NET New Server IP
