Games similar to Borderlands include Doom. It's paid, but Zandronum is free. Other options are Destiny 2, Shadow Warrior (Reboot), Bulletstorm and The Darkness II. There's no shortage of First-Person Shooters like Borderlands, with more than 25 alternatives for Windows, Mac and Linux.
Doom is a science fiction horror-themed first-person shooter video game in which players assume the role of a space marine, popularly known as "Doomguy", who must fight his way through the hordes of invading demons from Hell.
United States
Humanity's last safe city has fallen to an overwhelming invasion force, led by Ghaul, the imposing commander of the brutal Red Legion. He has stripped the city's Guardians of their power, and forced the survivors to flee.
United States
Shadow Warrior is a series of first-person shooter video games that focuses on the exploits of Lo Wang, a modern ninja warrior who fights through hordes of demons.
Poland
EU
Bulletstorm focuses on combat, both with firearms and melee attacks. There are a variety of fictional firearms available, although the game also places heavy emphasis on kicking enemies and using the energy leash.
PolandEU
The Darkness II is an intense first person shooter that puts you in the role of Jackie Estacado, don of a New York crime family and wielder of an ancient force of chaos known as The Darkness.
Canada
Prodeus is a first-person shooter of old, re-imagined using modern rendering techniques and technology. Experience the quality you’d expect from a modern AAA game, designed with retro aesthetics and gameplay that invoke the tech-imposed limits of older hardware.
Canada
Tom Clancy's Ghost Recon is an American video game series of military tactical shooters, created by Red Storm Entertainment, a game development studio founded in part by American author Tom Clancy.
United States
A retro-styled ultraviolent FPS by finnish developer Studio New Blood. You play as "V1", a robot that travels hell to get blood as fuel. "Mankind is dead. Blood is fuel. Hell is full.".
United States
Developed by id® Software, the creators of DOOM® and QUAKE®, RAGE is a groundbreaking first-person shooter set in the not-too-distant future after an asteroid impacts Earth, leaving a ravaged world behind.
United States
Zandronum is a multiplayer oriented port, based off Skulltag, for Doom and Doom II by id Software.
From the independent studio that brought you Contrast, We Happy Few is an action/adventure game set in a drug-fuelled, retrofuturistic city in an alternative 1960s England. Hide, fight and conform your way out of this delusional, Joy-obsessed world.
Canada
Aliens vs. Predator is a science fiction first-person shooter video game, developed by Rebellion Developments
Japan
