Top 4 C++ source-port Projects

NBlood

9 564 9.6 C++

Reverse-engineered ports of Build games using EDuke32 engine technology and development principles (NBlood/Rednukem/PCExhumed)
Doomsday-Engine

4 254 6.0 C++

A portable, enhanced source port of Doom, Heretic and Hexen.

Project mention: Best way to get into classic Doom? | /r/Doom | 2023-05-14

The go-to granddaddy of making it more modern is probably GZDoom. For some reason I don't remember, I didn't get on with it as well for "real" doom, only the big mods. (https://www.zdoom.org) My personal favorite that adds just enough graphical/audio enhancements without fundamentally altering the game, is Doomsday Engine (https://dengine.net/)

InfluxDB

www.influxdata.com sponsored

Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
CatacombGL

2 135 4.9 C++

CatacombGL is a source port with OpenGL graphics for Catacomb 3D (1991), The Catacomb Abyss (1992), The Catacomb Armageddon (1992) and The Catacomb Apocalypse (1993).
d2x-xl

5 5 5.4 C++

stability improvements for d2x-xl

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).