$ debtags search works-with-format::man | head
docbook-to-man - converter from DocBook SGML into roff man macros
docbook-to-man:i386 - converter from DocBook SGML into roff man macros
docbook-utils - Convert DocBook files to other formats (HTML, RTF, PS, man, PDF)
docbook2x - Converts DocBook/XML documents into man pages and TeXinfo
docbook2x:i386 - Converts DocBook/XML documents into man pages and TeXinfo
doclifter - Convert troff to DocBook
dwww - Read all on-line documentation with a WWW browser
dwww:i386 - Read all on-line documentation with a WWW browser
ebook-speaker - eBook reader that reads aloud in a synthetic voice
ebook-speaker:i386 - eBook reader that reads aloud in a synthetic voice

$ debtags search works-with-format::man | grep -v ':i386' | head
docbook-to-man - converter from DocBook SGML into roff man macros
docbook-utils - Convert DocBook files to other formats (HTML, RTF, PS, man, PDF)
docbook2x - Converts DocBook/XML documents into man pages and TeXinfo
doclifter - Convert troff to DocBook
dwww - Read all on-line documentation with a WWW browser
ebook-speaker - eBook reader that reads aloud in a synthetic voice
git-man - fast, scalable, distributed revision control system (manual pages)
gman - small man(1) front-end for X
gmanedit - GTK+ man pages editor
gnulib - GNU Portability Library