nixpkgs/pkgs/by-name/or
..
oracle-instantclient
oranchelo-icon-theme
oranda
oras
orbiton
orbitron
orbuculum
orc
orca
orca-c
orca-slicer
orcania
orchard
orchis-theme
ord
oreo-cursors-plus
org-stats
orion
orjail
orocos-kdl
orogene
ortp
ory
orz