[Falkon1313]

I don't. Mine just lapse into torpor, sometimes indefinitely, but more often I end up cycling back when my interests cycle back around to whatever they were about. They seem to be roughly seasonal. So if I look at created/modified dates on one of my old unfinished projects I'll see something like:

file_a 2014-05-04

file_b 2015-04-17

file_c 2016-03-23

Clearly that's something that my mind gets interested in around springtime (for no consciously apparent reason). I wrote it in one language in 2014, redesigned it in 2015, and rewrote it in a different language last year. Who knows what I'll do with it this year or next?

I don't purge because I know I'm likely to want to take it up again, or at least pluck part of it out to use in something new.