First off let's try to define the term. I would assume that a modern "retro" FPS game explicitly aims to capture the look & feel and/or the design aesthetic of popular FPS titles from the 90s (Wolfenstein 3-D, Doom, Duke Nukem 3D etc.). The resulting projects seem to vary widely due to different developers' perceptions of what constituted core elements of the 90s FPS formula, nostalgia glasses and this "indie BIG PIXELS" trend that has been observed lately. For simplicity's sake, and not to diminish the scope, let's consider a modern "retro" FPS game any title that has any of the following features (the list is not exhaustive I guess):
- is a self-proclaimed retro game as stated by developers
- explicitly mimics features of a known 90s FPS title
- runs on an authentic engine from the era (Doom, Duke3D, Quake etc.)
- uses an art style similar to what was common in the 90s (sprites, low-poly models, voxels etc.)
- avoids modern FPS tropes like regenerating health, limited weapon arsenal the player can carry etc.
- tries to imitate level design peculiarities like 90 degree walls of the Wolf3D era for example
- uses any of various techniques to imitate "pixelly", "low-res" look
Now let's move on to the games themselves, this is not an exhaustive list but what I am aware of are (in no particular order):
Project Warlock (released 2018) - discussed in a separate thread here.
Prodeus (WIP) - discussed in a separate thread here.
Ken's Labyrinth II (WIP) - discussed in a separate thread here.
RetroBlazer (on hold) - discussed in a separate thread here. A demo was available from the now-offline official site (Wayback Machine link).
STRAFE (released 2015) - discussed in a separate thread here.
Wrack (released 2014) - discussed in a separate thread here.
Dusk (released 2018) - discussed in a separate thread here.
Wrath: Aeon of Ruin (WIP) - this was apparently announced (sort of) in a thread at Doomworld in 2017, a very early footage is available here. It uses sprites (or at least, used at some point in development) in a very distinct style and aims for a Heretic/Hexen vibe as it seems, but with some firearms too. Some of the WIP stuff shown earlier in the Doomworld thread has been removed though, no info on the developer's website either at this moment. It seems that the project went dark as of now, I wish it stuck with the design of the first video shown.
In The Kingdom (demo released 2014) - I discovered this project a while ago (not sure when exactly) and it was hard to track down back then. A video discussing it an showing gameplay is available here.
LAB (v3.0 released 2018) - discovered this just now, Wolf3D/Blake Stone style design, but there are many more like it and often not good quality apparently (as discussed here).
Membrane (WIP) - a GZDoom engine game.
The Adventures of Square (Episode 1 released 2014) - a Doom engine game but has a lot of Duke3D vibes going on.
Harmony (released 2009) - ZDoom engine game.
Gunload (WIP) - discussed in detail in the development thread.
Rise of the Wool Ball (released 2017) - excellent game that pays homage to Rise of the Triad, with a distinct art style, uses ZDoom engine.
Intrude (released 2016) - a Wolf3D knockoff, haven't played it.
Caesar's Revenge (WIP) - might be worth checking out, there's a dev blog with some interesting visuals.
Gun Godz (released 2012) - Wolf3D-esque game with low res graphics and Doom-like gameplay and weapons.
Shaw's Nightmare (released 2013) - runs on the Build engine, aims to play like Doom.
Gloomy Dungeons 2 (released 2013) - probably even more like those Amiga games along the lines of Alien Breed 3-D or Gloom than Wolf3D.
Shootrage (WIP)
This list is obviously incomplete, I found a few titles just now by Googling the subject matter, so any feedback on more games of this type is pretty welcome. I haven't included games that aspire to recreate the 90s style gameplay without sticking to the "retro" visual design aesthetic like Hellbound, Amid Evil or Apocryph, but perhaps we should discuss them as well seeing as how the developers claim to follow the classic 90s gameplay formula.