Wattz Laser Rifle: https://www.nexusmods.com/fallout4/mods/26386
This is by far my favorite weapon in Fallout 4 (not just out of modded weapons,
all
weapons). Powerful without being broken, and highly modular; on most playthroughs my 3 most-used weapons are just three variations of the Wattz rifle (red-laser sniper, blue-laser scattergun w/ Wounding prefix for close combat, and Enclave green plasma rifle for mid-range).
Any apparel by Niero is also highly recommended. I'm partial to the CROSS Courser Strigidae outfit:
https://www.nexusmods.com/fallout4/mods/28009
The CROSS jetpack is also a ton of fun. Arguably OP, but having access to a jetpack without the Power Armor / fuel restriction makes farting around in the Commonwealth sandbox a blast (it drains your AP to use, so it's not completely broken):
https://www.nexusmods.com/fallout4/mods/12471
Simple questions deserve long-winded answers that no one will bother to read
https://imgur.com/1WshTZu - by DB_Insider https://imgur.com/eW67nT8 - by Wii_Shaker