Any stand out mods? Our group has played 7d2d and enjoyed it, but I didn't realise it had mods - could give us another stint of gaming on it.
It has at least hundreds of mods. Maybe thousands. One drawback is that 7DTD is still in alpha. The recent relabeling of alpha 22 as 1.0 was a purely business move - the game is very definitely still in alpha and still says so on the loading screen. Core parts of the game have been changed repeatedly. As a result, mods are for a specific version only and might or might not work with any other version. Some of the biggest mods haven't been updated for 1.x yet (and some might never be).
It's possible to switch to most alphas, going back as far as alpha 8. The devs have made them available through the Steam option labelled "betas".
It's also possible to do a straight copy and paste of the whole game and have a functional 2nd (or 3rd, 4th, etc) installation on the same machine, with different mods for each. Which is what I do - one installation as vanilla, autoupdating through Steam and 1 or more other installations as various other versions of the game with various mods on them.
Modding in 7DTD is usually done manually. There is a mod manager (it's called 7DTD Modlauncher), but not all mods are available through it and I found it less convenient to use than adding the mods manually. In almost all cases it's just a matter of putting the mod's files in the 7DTD folder called "Mods". That's created as part of the base game install from A22/1.0 onwards and can be manually created for earlier alphas. There are guides online. It's really straightforward.
The two main sources of 7DTD mods are a dedicated website and Nexus:
Best 7 Days to Die mods are here for you! You can download all 7 Days to Die mods comfortably and quickly! Come and enjoy the 7DTD mods with us!
7daystodiemods.com
Having said all that, the first question is "How modded?". Are you after modlets for specific things? Or are you after full blown overhaul mods? I only play overhaul mops now, have done for a while. I played one game vanilla in A20, A21 and A22/1.0. So I can only answer your question if it's overhaul mods you're after. There are quite a few and all the ones I've played were very good. I'll mention a few here, but there are many.
Darkness Falls is the best known overhaul mod, but A22/1.0 version of DF is experimental and does have bugs. A21 and earlier work fine. It's a lot harder than vanilla, a lot more complicated and goes a lot further. The difficulty scales a lot higher with gamestage. You end up facing flying demons with powerful ranged attacks. It even has a storyline.
War3zUK is the hardest start. The design philosophy is different. You're not the centre of the world. The world doesn't give a damn about you. It's endgame hard from minute 1 of day 1. First game I played, I encountered a giant flaming zombie dog with an always on AOE fire attack before I even made it to the first trader. Expect to run away a lot. Expect to die. You have classes, many new weapons, new POIs, far more complex farming, etc, etc. It has been updated to A22/1.2, the latest version of the base game.
Joke Mod is weird. It's a full overhaul mod, a serious mod. But it's also a huge collection of jokes, all of them bad. And that's not just the "dad jokes" you find. Everything is played for laughs. You can get a clown car as your vehicle. Or a unicorn. Which is actually a horse with a big ice cream cone on its head. Your first repair tool is a rubber hammer. Which squeaks as you use it. I like it a lot.
Craft Until You Die is a little known overhaul mod, perhaps because it's a German mod. It contains a mostly complete mostly accurate English translation. It's definitely playable in English. I'm currently on about day 120 of a playthrough. It's very crafting-orientated. >30 crafting workstations. New raw materials. Many new items (screws, ball bearings, circuit boards, power cables, etc, etc, etc). It's very hard and progression is very slow. I didn't get a minibike until day 46 and I didn't get a motorbike until past day 100. It's updated to A22/1.2, the latest version of the game. I could only find it on Nexus.
Some other overhaul mods (an incomplete list off the top of my head): War of the Walkers, The Wasteland (a Fallout-flavoured 7DTD), TongoMod, Undead Legacy, Preppocalypse, Outback Roadies (7DTD Australian Edition), Wild West Mod (best played with the custom map included with the mod, which contains only the mod's custom mid-late 19th century POIs), Age of Oblivion, Sorcery (adds magic to the game).
Or if you want vanilla but with lots of new POIs, the simplest way is to add the Compopack mod. There's over 1000 new POIs in it.