Ask HN: What is that standalone organization program that orgmode people like

This standalone program was supposedly good for organization for programmers; i remember it had a subpar GUI that people complained about but was really good. I think there was some green in the GUI. I can't find the program googling around. I first saw it on HN which is why i'm asking, but the site:news.ycombinator.com google queries i'm trying are not helping.

What is this program please?