I don't know if you took the link from a logged in page or something, but it contains a bunch of stuff. Here is a link without strange mumbo-jumbo:

https://www.humblebundle.com/software/be-a-creative-superhero

I realize it is perhaps a bit late to post this, but I thought some of the programmers on here might still get some fun out of it this year. From the about page:

Advent of Code is an Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like. People use them as a speed contest, interview prep, company training, university coursework, practice problems, or to challenge each other.

You don't need a computer science background to participate - just a little programming knowledge and some problem solving skills will get you pretty far. Nor do you need a fancy computer; every problem has a solution that completes in at most 15 seconds on ten-year-old hardware.

https://adventofcode.com/2019

Personally, I am using it as a way to try out the Rust programming language this year :Thmbsup:.

I am sorry to hear that app, I think this underlines the importance of having good export/import functionality so your data does not get locked in a proprietary format. I am a little surprised the Surfulater author apparently created a new app (Clibu) with no way to import from Surfulater?

For what it's worth, I moved from Evernote to CintaNotes, which is a lot more bare-bones, but works well for many of the type of notes I keep. Besides that I keep a development log in markdown in plain text files.