Mad Miners adds some enemies and some tools. It also adds a new biome. It's focused on a mix of fantasy and industry.
Biomes
Frost Wasteland - Similar to Snowy Tundra
Enemies
Ice Spew - 200 HP
Joint Run - 300 HP
Armor
Obsidian Armor - High protection but adds slowness effect.
Frost Armor - Low durability but high enchantability and adds strength effect.
Ember Armor - Gives fire resistance effect.
Materials
Ice Crystal
Magnets
Redstone Motor
Sawblade
Industrial Heater
Electro Chunk
Ember Ore
Tools
Frost Thrower - Fast ranged weapon that consumes snowballs and has high knockback.
Industrial Drill - Drill made with iron blocks and a Redstone Motor and breaks 9 blocks below it, also dropping the blocks it breaks.
Industrial Furnace - Furnace that smelts iron instantly, uses a coal block, and generates 2 iron per iron ore.
Industrial Saw - Saw that can destroy along the X and Z axis.
Food Cleaner - Transforms rotten flesh into porkchop if powered with water.
Glass Painter - Turns normal glass into stained glass with dye. (Only works for glass blocks, not panes.) (Cannot be obtained in Survival Mode)
Electric Fence - Extremely strong and damages people who touch it.
Obsidian Smasher - High damage but low attack speed. When right clicked on blocks, gives the slowness effect for 3 seconds then explodes the area around. Good for mining.
NOTE: This is still in development, there are lots of bugs. I also used MCreator for this.