This is MIDIOMETRY, a free & open-source plugin that visualizes your playing. (This plugin does NOT visualize audio, just MIDI inputs!)
(This guide assumes you already know how to add VST3/CLAP plugins to your DAW.)
To install MIDIOMETRY, go to the "Actions" tab of this repository, click on a build (you probably want the most recent build, assuming it passed), and scroll down to the "Artifacts" section. From here, download the zip file for your platform* and extract the contents.
Then, follow your normal process for adding plugins to your DAW, whether it be adding the plugin files to your OS's default plugin locations, or to a custom location.
*If you're not running Windows, Mac, or Ubuntu, you can try downloading the source code and building the project yourself. However, this might not work.
Ableton doesn't have very good support for pure MIDI plugins - you'll probably have to use a workaround, e.g. where MIDIOMETRY has its own track, and you send the MIDI out to another track with an instrument on it.
I haven't tested FL studio at all.
Bitwig has the best support for MIDI-related plugins and should work seamlessly.
This plugin may or may not work if you're on Linux. In my testing with Bitwig (individually sandboxed plugins), everything has worked fine. However, if you're not using the same sandboxing, or if you're using a different DAW (Reaper, etc.) this might work sometimes or not at all. Good luck.
Please open an issue on this repository if something isn't working, and I'll do my best to respond and work on it.