I've had a Yale keyless (different to another model they do called keyfree) lock for years and love it.
It fits to any front door that has a standard daylatch/nightlatch on the back, likely even compatible with your existing latch. So you may not even need a specialist keyless supplier.
I just bought it from their website (they do offer installation there too actually). Installation is a breeze if you're remotely handy. It's drilling one hole of a certain width on top of a paper cut out to mark the spot, then threading some wires through that and otherwise it's just screwing the battery pack and lock to the door.
The lock does code pad entry, or contactless cards, or fobs. If you buy the RF module it can connect to home automation solutions, I used it with Smartthings for a while before Samsung ruined Smartthings. I imagine it integrates with other home automation solutions just as well. Once integrated with a home automation solution you can do things like unlock with phone or 'unlock when'. I've always thought something like 'unlock when my nest cam detects it's my face at the door' would be pretty cool, but still very much on my to-do list!!