miniconda

https://docs.anaconda.com/miniconda/install/#quick-command-line-install

mkdir -p ~/miniconda3
wget https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh -O ~/miniconda3/miniconda.sh
bash ~/miniconda3/miniconda.sh -b -u -p ~/miniconda3
rm ~/miniconda3/miniconda.sh

pyenv

https://github.com/pyenv/pyenv?tab=readme-ov-file#1-automatic-installer-recommended

curl -fsSL https://pyenv.run | bash

rbenv

https://github.com/rbenv/rbenv

apt update
apt install rbenv