Tempest051

It's a pretty simple mod that adds some flavor to your inventory. I'm a sucker for aesthetics, so this mod has become a must, along with legendary tooltips. This will also integrate with legendary tooltips for item border colours if you want (highly recommend both for even more spice). It also allows you to locate valuable items in your inventory faster, which, if you're a loot hoarder like me, is really useful when you're trying to decide what to drop while being chased to pick up even more loot :D.

It's like The Thing. But in Minecraft. If you're a fan of horror, and like having your *** handed to you by rifted endermen that teleport around the map and scare the s*** out of you, then definitely check it out. My only (minor) gripe is with the default values for mob stats. These mobs are like damage sponges. With the damage adaption mechanic, they can become immune to almost anything. You can straight up pelt them with a 30mm gau turret from NTM, and they'll just walk it off. Thankfully every single value can be edited in the absolute unit of a config file.

It's Startrek in Minecraft, what's not to like? You can build spaceships and physically fly them (ok it's more like jumping) around space and land on other dimensions.
More of a pack utility than a plug and play mod, since you have to set up the configs for space and planet mapping yourself.
Only downside is that certain things like unusually coded blocks, multiblocks, etc often are not supported. Best case scenario, they break every jump and have to be reassembled/ or placed again. Worst case, your world gets corrupted. Rotating your ship is a bit iffy at times too, and has even less support for modded blocks. Best to test blocks on a superflat test world, and never rotate your ship when jumping. But otherwise a really freaking cool mod.

Alchemistry is one of my favorite mods. If you like chemistry like me, then this mod is loads of fun. On its own it doesn't do much, but in a modpack can be configured for all sorts of custom progression and research. The default conversions/ recipes are a little OP in some cases, but with some adjustment (like drastically increasing the amount of chemical needed to craft something, and some recipe edits, because being able to craft thousands of ingots from a small vegetable farm is a little.... ya) this totally fits into a pack that is heavy on science and material synthesis.
The best part is, it's 100% configurable. If you don't need a specific element or compound, you can just remove it. And my favorite part is that you can add your own compounds and elements, so you can add just the compounds you need, or even create fictional elements and compounds to fit your pack (a bit of a time consuming pain to create ones that would realistically work and chemically make sense at least a little, but that just makes it all the more awesome).

Before Jetpack, I'd never even heard of the run and gun genre. But now it's one of my favorite. Constantly bouncing around off walls and shooting mobs, the gameplay is just really smooth and fun. When I want to relax and play casually, I play Jetpack.
Jetpack and Trepidation are probably the two best modpacks in this genre, so if you liked one, you'll like the other.

Twilight Forest is one of the oldest dimension mods, and one of my favorite. It has a cool atmosphere and very unique dungeons. Clearing a ghast tower for the first time is one of my earliest modding memories. 10/10 would recommend. Also recommend turning off the cicada sounds in the config. They're annoying af >_>.