I make tools for my own use, but share them in case anyone finds any use for them.

ClipIT
Web based chat analysis tool for VTuber clippers. Interactive chat activity graph with keyword filtering, chat search, and embedded player.

Chad
Simple python script to generate an interactive chat activity graph for a YouTube or Twitch stream.

W.A.P
A Discord app written in Python providing a slash command to generate a chat activity graph for a YouTube or Twitch stream.

VodTS
Chrome extension to make it easier to create and use timestamps for YouTube and Twitch streams/vods.

OpenCaptions
Free & Open-Source Multi-Track Subtitle to Text+ tool for DaVinci Resolve. No subscriptions. No paywalls. Just captions that work.

Bell Uuuuu Christmas
A short 2D visual novel with minigames, in the minigames you play as bell (Lumi TTS pet) (unfinished)

Lemon
🍌but it's a🍋 ?, Lemon is a simple Clicker Game, but Kaneko Lumi / Lemon themed. (unfinished)

LemonXP
Fantasy operating system similar to windows xp but inspired by the vtuber kaneko lumi from phase connect (unfinished)
I watch Anime Girl Streaming on the internet, and sometimes I clip moments I find interesting. That's about it.
The short simple version
I'm David, a guy who writes Code and watches VTubers… Oh, and I clip VTubers from time to time…
The more complete Answer
I have been a Professional Firmware developer for the last 10 years, and have been programming for 15 years. I studied Electronic circuit design with a specialization in embedded system programming… but that was many years ago….
Since embedded systems don't live in a vacuum alone, I ended up having to code CLI tools, server backend, and even frontend… At this point, Golang is my favorite language for CLI tools and backend… and I hate frontend… with a passion…
So yeah, C, C++, C#, Java, Python, Golang, JavaScript, TypeScript, ARM Assembly, HCS12 Assembly, x86 Assembly, are all stuff I had to play with over the years. ("Why not Rust?" I tried it, it was fine, I guess… the community made me hate it…)
If you take a bus or a train in a major city in the US or EU, you have probably been in contact with some of the products I worked on developing.
For fun, I watch VTubers, and I started making clips to share moments I find interesting. Being a developer, I ended up making a few tools connected to clipping, most of which are open-source, unless the code is so bad that I don't want to show it.