Package list: page 562
- optimizer
- optipng
- optlang
- optuna
- opus
- opus-tools
- opusfile
- opustags
- opustex
- ora2pg
- orafce
- orage
- oralb-ble
- orange
- orange-canvas-core
- orange-spectroscopy
- orange-widget-base
- orange3
- oras
- orbit
- orbit-predictor
- orbit2
- orbit2cpp
- orbital-eunuchs-sniper
- orbitcpp
- orc
- orca
- orca-sops
- orcania
- orchis-theme
- ordered-clojure
- ordered-map
- orderless
- orderly-set
- oregano
- org-appear
- org-bullets
- org-caldav
- org-contrib
- org-d20
- org-drill
- org-make-toc
- org-mode
- org-mode-doc
- org-present
- org-roam
- org-tree-slide
- orgadoc
- organicmaps
- organize
- ori
- origami
- origami-pdf
- original-awk
- ormar
- oroborus
- orocos-bfl
- orocos-kdl
- orp
- orp-classpath