Mosaico.io alternatives

Hi, 

Can you suggest a good alternatives to mosaico? What I’m looking for is something that allows me to create couple of standard newsletter templates which can be changed by users but some elements stay the same e.g. footer, top module etc. I need full customization. It must be something that is not operated on provider cloud just on my own server, it has to be independent. It would be nice if licence is lifetime, paid once.

Mosaico is not very intuitive, I feel like documentation is pretty poor as well. I’m having trouble finding solutions to my problems, on forum there are many questions but very few answers.