Model Railroads by vincentmet, MrMC, DarthRafael
This mod adds a whole range of track pieces, locomotives and rolling stock. You can build you own layout, and run trains, in your attic, without taking up too much space!.
Omni-Goggles by Selim_042
Adds a singular pair of goggles, with the HUD effects of different mod's helmets.
Engineer's Toolbox is a tech mod with a focus on customization. It's based around blocks called sockets which can have modules installed on their sides to serve various functions. Different modules can do everything from simple redstone logic, to generating energy
CT Mortar by codetaylor
A simple mortar and pestle mod that adds four tiers of mortars with configurable durability.
Eternal Winter by ichttt
Makes it snow everywhere. If it should be used server side only. you may consult the coremod in addition to this mod to display snow instead of rain on the client. To circumvent the coremod (which may break things), just install this mod on the server and on the client.