multiman foobar opens your web browser to manual page of foobar on various OSes:
- opengroup.org for POSIX-defined manual
- debian manual pages
- archlinux manual pages
- freebsd manual pages
- openbsd manual pages
- netbsd manual pages
- ss64.com for macosx manual pages
Pass -n option to only display URLs that would be opened, but don't open them.