Headspace - Meditation made simple. Brilliant things happen in calm minds.
Sway - Sway is a drop-in replacement for the i3 window manager, but for Wayland instead of X11.
Meditation Studio - Curated collections of guided meditations
Plum Village - Free mindfulness app w/ Zen Buddhist meditations + teachings
Calm - Calm.com can help you reduce stress and increase calm.
Smiling Mind - Promotes mindfulness and meditation for young people