Debian APT repository for misc packages not yet available in Raspberry Pi OS. This repo contains the build scripts and installation instructions. The APT repo itself is hosted on PackageCloud.
To add the repository to your system, do:
curl -s https://packagecloud.io/install/repositories/Alvarito050506/rpi-debs/script.deb.sh | sudo bash
After that, you can install any of the packages listed here normally:
# Replace PACKAGE_NAME with a valid package name (e.g. adoptopenjdk-16-jdk)
sudo apt install PACKAGE_NAME
adoptopenjdk-16-jdk
: AdoptOpenJDK build including the entire JDK (no JRE, since it's not necessary, but it could be generated).