Top 10 Nix HacktoberFest Projects

nixpkgs

366 11,250 10.0 Nix

Nix Packages collection

Project mention: MultiMC Good? | reddit.com/r/MultiMC | 2023-01-30

Huh, I did some digging out of curiosity. Not sure if the this is the definitive answer, but it sounds like there was a MultiMC fork called PolyMC and the head developer of that fits the bigot description you're referencing here. The PrismLauncher people are, apparently, the fork of the fork, having taken PolyMC and moved on to create PrismLauncher.
haskell.nix

8 458 9.5 Nix

Alternative Haskell Infrastructure for Nixpkgs

Project mention: Why does Nix have Haskell packages that are incompatible with GHC for a given version? | reddit.com/r/haskell | 2022-12-29

I'm not a great haskeller but I found haskell.nix better for Haskell projects, like the commenter on Discourse suggested. I've had a few issued regarding package versions with nixpkgs that haskell.nix solved.
SonarLint

www.sonarlint.org
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nix-1p

2 452 3.3 Nix

A (more or less) one page introduction to Nix, the language.

Project mention: pellets: manage your packages with a configuration file | reddit.com/r/archlinux | 2022-11-06

Fair enough. I've also had a couple of programs which weren't packaged already, fortunately it's quite easy to do so most of the time (or to just fall back to a distrobox container or flatpak in the worst case). If you decide to try it out, nix-1p and Nix Pills were great resources for me to get familiar with Nix and NixOS in a short time-span.
dream2nix

4 370 8.9 Nix

Automate reproducible packaging for various language ecosystems [[email protected]]

Project mention: New BFF | reddit.com/r/NixOS | 2023-01-28
fenix

1 223 7.1 Nix

Rust toolchains and rust analyzer nightly for nix [[email protected]] (by figsoda)

Project mention: Have a few questions about NixOS | reddit.com/r/NixOS | 2022-05-31

4. I would suggest Mozilla's Rust overlay or fenix or similar instead of Rustup - that would be more of the "Nix-way" to acquire the toolchain and you can still manage multiple versions. Not sure what the Ruby equivalent is, I don't do Ruby.
nixvim

3 184 9.2 Nix

Configure Neovim with Nix!

Project mention: Best way to setup Nvim on NixOS? | reddit.com/r/NixOS | 2023-01-08

Now, if you want to adopt a more "nixy" approach, I suggest you to take a look at nixvim. I do not use this project personally but it looks very promising.
nix-rice

0 61 0.0 Nix

A library to functionally define your configuration and theme (rice) with Nix
InfluxDB

www.influxdata.com
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Build time-series-based applications quickly and at scale.. InfluxDB is the Time Series Platform where developers build real-time applications for analytics, IoT and cloud-native services. Easy to start, it is available in the cloud or on-premises.
nix

0 26 9.7 Nix

my nix modules, overlays, host configurations, and more! (by jpetrucciani)
nixexprs

1 20 7.3 Nix

nix stuff

Project mention: Anyone figure out how to apply nvidia-patch in nixos? | reddit.com/r/NixOS | 2022-06-02

nah it's really the same thing in the end, packageOverrides are just simple overlays.
machine-configuration

0 6 2.6 Nix

Configuration files for my NixOS installs

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). The latest post mention was on 2023-01-30.