Factorio

Dead aliens are now good aliens! Aliens will pay for your base defense! On their death, they bring back the 0.14 alien artifact. They also drop alien ores as loots, which can be morphed into ordinary ores like iron ore. Also adds alien science pack that can be used for research in other tech mods. Well-suited for combat-heavy, no-mining scenarios. (Locale: English, Deutsch, 正體中文, 简体中文, Русский, Português Brasileiro, Español) (Partial Locale: العربية, Беларуская, Български, Català, Čeština, Dansk, Ελληνικά, Eesti, Suomi, Français, עברית, Magyar, Italiano, 日本語, 한국어, Lietuvių, Latviešu, Nederlands, Norsk, Polski, Português, Română, Svenska, ไทย, Türkçe, Українська)

Adds GUI to display evolution factor and monitor alien spawn rates. Adds progressively higher tiers of aliens (configurable) at very-late game, bringing some real challenge! (Locale: English, Deutsch, 正體中文, 简体中文, Português Brasileiro)

Two game modes: PVP: Two teams fight a battle for their science robots. A mix o Wave defense and PVP scenarios, plus robots and jails. PVE: Defend your robots, and try to survive with your friends

Be prepared for the big monsters from this planet!

A glowing enigmatic life form was found to inhabit alien forests at night. Based on the original mod by Betep3akata. Probably won't work in multiplayer.

Adds alien artifacts back in to the game. Get artifacts from destroying spawners and worms and craft them into Space science packs. Updated to 0.16 and edited by fishycat.

Ever seen the movie "Pitch Black"? If you're having trouble surviving contact Vin_Diesel@PitchBlackSupport.com. Lastly, keep an eye on warning messages and your pollution output. Updated and maintained by me (Choumiko) until Reapa reappears

Adds laser-resistant aliens, who counter laser turrets. Also adds fire-resistant aliens, who counter flame turrets. They will put some pressure on your base defense. (Locale: English, Deutsch, 正體中文, 简体中文, Русский, Português Brasileiro, Español)

Improves the enemies tactics by using potential fields/pheromones allowing probing of defenses, retreats, reinforcements, counterattacking, breaching, raids, rallying death cry, and player hunting. Uses non-homing blockable biter projectiles. Adds new Enemies (disabled by default). Can completely replace the vanilla AI. Difficulty setting in mod options menu.

This mod adds a nest of explosive aliens and worms! These aliens will explode on death (area damage) and spread fire. Fire spitters are also deadly burning everything! And if you see their Mother, run, run for you life! Say goodbye to your walls! Good luck! Note:Autoplace configured for hot areas found in alien-biomes mod.

Inventory items and grid equipment inside destroyed containers, like chests, vehicles (cars, tanks), will now spill over ground, instead of simply vanish. Adds a hotkey to pick items on ground with adjustable pickup radius. (Locale: English, Deutsch, 正體中文, 简体中文, Русский, Português Brasileiro)

Adds new Enemies to the game. 5 new biters and 5 new spitters, each with their own unique strengths and weaknesses. If you want a more of a challenge than what Vanilla can offer you... Compatible with Rampant and Bob's. Recommended to use with NE Buildings

"They mostly come at night. Mostly." -- Biters in polluted areas become more aggressive at night. Includes an option to have biters only attack at night.

Biters now drop alien ore, which can be smelted into alien metal, which is the ingredient for alien items that are better than their vanilla counterparts. Also introduces Hyper-Modules which level up after killing a lot of Biters. The mod is compatible with Bobs Enemies, Rampant and Natural Evolution Enemies.

Its a Corrosive Planet. Your machines will slowly get damage, and you have to repair them before it blows up.

Allows the biter/spitter spawn ratio to be modified.

Adds a few harder enemies.

Gives extra control to tweak biter spawning, quantity and movement beyond standard map settings

You want killing enemies become more usefull and get some more usefull stuff in this game? Then this mod is for you. Adds enemy drops and exploitation of their corpses. Also provides fireball (incl. towers) and poison ammo.

Adds Behemoth and Colossal worms in the late game. These worms can burrow and dig to your base, then attack from beneath.