There are some additional filters here: http://wiki.audacityteam.org/wiki/Nyquist_Effect_Plug-ins#Filters
Audacity also ships with this set of filters, but not enabled by default: http://manual.audacityteam.org/man/classic_filters.html
There’s also this set of filters: https://forum.audacityteam.org/t/high-pass-low-pass-band-pass-band-cut-filter/28257/1