There are a bunch of guides out there from BTCsessioms & block stream.
I think there are a number of exchanges that use liquid like Bitfinex & BTSE.
Apps holding the keys yourself there is side swap & green wallet.
For swaps you can use boltz or robosats.
Sideswap does swaps for a 0.1% fee, better than Boltz which I believe charges 0.3%, and Liquid->base chain swaps usually come off their hot wallet rather than a full federation peg-out, so it's faster and there is no link between the Liquid address and the base chain address.
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