The same thing(s), but written in different ways.
Now that I have More Time, I'm probably going to be implementing similar things in different ways. I know I'm going to want some side-by-side modern language vs BASIC over at Modern Retro(e). Plus there's some things, say like a Yahtzee™ style dice game, in different ways. Like BASIC (for Applesoft BASIC), Swift (for iPhong), and Lua (for Playdate). Might make a fun compare-and-contrast. Or might not. Could be totally pointless, and you, poor reader, looking at this 9 year old README in a repo with seventeen commits. I shall weep for you.