A couple more:
I have made a Boring Bar set and Worden Tool & Cutter grinder from Hemingway kits; and am part-way through a Stent T&C Grinder (Blackgates).
For bar, tube and sheet forming equipment:
One option is Warco, I have one of their small '3-in-1' formers.
W.N.S., based in Rochford, Essex; supplied my tin-man's jenny (Its operating-manual calls it a "Rotary Machine ", which is true, but a bit odd! Most of WNS' products are industrial-sized and powered, for the manufacturers of ventilation-ducting and similar; but they also sell a range of smaller, bench-sized shears, croppers, jennies, bar and tube formers, and similar. They sometimes sell second-hand machines, too, but as something of a side-line.
[Curiously, apart from areas like boiler-making and model locomotive superstructures etc., sheet-metal fabricating seems a bit side-lined in model-engineering. Perhaps that it is because it does not have many model applications; and I think suffers a bit from an unfair reputation. Not everything we make is a miniature replica of hefty plate-work, though.]
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And a big hand for TEE Publishing – I have probably a dozen books from them, most in the 'Workshop Practice' series; and have cited the appropriate ones a few times in this forum.
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My most recent tooling purchases was from Arc Euro others here have mentioned. My dividing-head is a Warco-badged copy of the Vertex B0, (though second-hand but apparently unused, via a bereavement sale within the club).