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Sharkstar
Airhead
There's Murex and Fibarex that are both common for exterior repairs. Fibarex is reinforced with fibres to provide some resistance to cracking, Murex has a high marble content and can be used on corners unsupported without slumping. Ideally you'd have both and pick which one suits the area best. The decorators supplier I use is an independant and they will sell the individual 1kg bags out of the 5 kilo big bags so it's easier to get what you want without having loads left over.
I wouldn't bother with an exterior corner trowel, you can use 2 trowels to get the same result or use a ply former. You can sort a lot out by sanding on exterior corners anyway.
Touprelith is the grey cement filler, I have used it in the past but Murex took over for some reason.