Optional Mods

Here's some more mods that are compatible with TFG but aren't included by default. Feel free to add them to your own instance of the modpack!

Visual

TFC Caelum (CF, MR) - a realistic sky mod that shows planets, accurate constellations, moon phases, and so on. Also adds rainbows! Not included by default because it crashes MacOS clients.
Xaero Zoomout (CF, MR) - Lets you zoom out further on the map.
Distant Horizons (CF, MR) - TFG comes with configurations to get it working with TFC's world generation.
BlueMap - TFG comes with a resource pack for it to work with some of TFC's blocks.

Shoulder Surfing Reloaded (CF, MR) - Improved third person camera mod. Client-side, so you can install it even if you're playing on someone else's server.
- Third Person Shooting: Zero (CF, MR) - Adds compatibility between Shoulder Surfing Reloaded and TACZ (the gun mod)

ILAORE's 32x Texture Packs - for TFC, Create, AE2, and GregTech. If you like higher detailed textures, you might like one of these, but keep in mind that a lot of blocks in TFG do not have 32x versions so there will be some style clashing.
Ad Astra 3D (CF, MR) - Replaces the usual pixelated textures of the celestial bodies in different sky boxes with 3D models. Goes great with shaders!
HotOrNot 3D Mittens (MR) - Changes the appearance of the TFC HotOrNot mittens into a 3D model.
Naturalis (CF, MR) - Makes fruit trees and grain crops more "bushy" looking.
TFC Livestock Skins (CF) - Adds some variations of livestock animals like alpacas, chickens, and ducks, based on the climate and block they spawned on. Requires ETF and EMF to be installed as well.

Epic Knights of TerraFirmaGreg (CF) - Adds additional weapons and armor to the TFC era of the modpack. Not included by default because of a lot of extra equipment bloat.
Via Romana: (CF) - Adds infrastructure driven fast travel. Allowing you create road networks with signs to travel between locations. TFG includes a built in config file for allowing roads to be made out of many of our blocks.

Create: Sound of Steam (CF, MR) - expands on create's Steam Whistle and adds a ton more options to let you play music. Not included by default because of how niche it is. We include our own recipes for it though.
Chimes (CF) - adds some wind chimes. Not included by default to avoid modpack bloat, but we do have our own recipes for it.
Create: Extra Gauges (CF, MR) - expands on create's factory gauges. If you add it to your modpack, you'll get TFG recipe changes.
Create: Railways Navigator (CF, MR) - Expands on train scheduling, adds passenger information displays for both trains and stations, and includes a navigator device that can tell you which trains to board for your intended journey. Not included by default because it primarily benefits large, rail-heavy multiplayer servers. Custom recipes included.
- Dragonlib (CF, MR) - A library required for Railways Navigator to work. IMPORTANT: The latest version of dragonlib has been found to prevent the game from loading. Versions 3.0.21 and 3.0.26 have both been reported to work.
Immersive vehicles: (CF) and its official addons with TFG recipe support by @ilikecupcakes
- MTS Official Content Pack (CF) Adds dozens of cars, planes, helicopters and tanks. As well as road signs/lights. Requires the base mod and the official automobile pack for recipe support.
- MTS Official Automobile Pack (CF) Adds several new cars. Requires the base mod and the official content pack for recipe support.