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Just wondering what do most of you dose your tanks with. Please include manufacture

I add calcium, raise the hardness and add magnesium to my tank.
Calcium, I alternate between purple up and my LFS brand. Alkalinity and magnesium are both my LFS's brand.
I don't add much for magnesium, I found my salt has around 1300ppm for mg in it, so as long as I keep up with my water changes, I don't need to do much buffering with it.

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I add Kent turbo calcium, Tech M, two part KH buffer (home made) & Iodine (soon to use Tech I)

Soon I will start dosing Kent's strontium/molebdenumenenen because it says when using straight Calcium chloride you need to add this.

Had been using Seachem products (Calcium, Buffer and Kalk) but now have the Ca reactor online with ARM media. Hopefully the reactor and regular water changes will keep everything in check.

I'm a big fan of Seachem products. I use Advantage Calcium (contains Magnesium & Strontium), Reef Builder (buffer), Kalkwasser w/vinegar for top-off, Seachem Reef Plus as directed, I run carbon, Seachem Purigen & Phosguard in sump 24/7. I will see how my Mg levels do as the tank goes on and suppliment as required.
I am considering trying the Polyp-Lab Reef-resh system in the future.