I've always used TP Basslane to center bass frequencies on stereo tracks but it's really the only 32-bit plugin I still use and I'd like to move away from it if possible. Does anyone know of a good free one? I don't really want to be dropping Ozone on multiple tracks. 

i don't use it myself, i have the voxengo lf max punch, but i think the only freebie might be http://www.kvraudio.com/p...by-alex-hilton-a1audio
or maybe channel tools could do it?

Yeah that Alex Hilton plugin looks like it might work, I'll give it a try. Channel Tools doesn't do it unfortunately - I wish Cakewalk would give us a better stereo tool. I need something which centers frequencies below a certain cutoff.

Mongoose by Boz Digital labs. I was lucky get it for free intro offer.. but it might quite cheap otherwise.

Not free but you might already have it: T-Racks Quad Image.
I use it for that same purpose.

This video https://youtu.be/p_-PjWts3nI?t=1m55s describes how to do it with M/S EQ.

scook
This video https://youtu.be/p_-PjWts3nI?t=1m55s describes how to do it with M/S EQ.

I did not watch the video, but I was about to reply anyway.  Pick up Voxengo's free MSED, which can control the stereo width.  Use that in conjunction with an EQ in your DAW, and you  can get to where you want to go.  Or just put MSED right on the bass track itself, configure it to center the signal as mono, and don't even bother with EQ.

https://www.plugin-alliance.com/en/products/bx_solo.html
http://www.toneboosters.com/tb-midsidetransformer/
http://www.tokyodawn.net/tdr-nova/
to name a few