Alex Pankratov's personal site, covering his work on Hamachi, small tools, and web and browser experiments.
HN links it for Hamachi's history; commenters remember it fondly as a focused app that declined after LogMeIn bought it.
You don't actually seem to be using the logo anywhere, though. On your site you write that "I had (have) plans to write an Instant Messenger client with proper support for privacy. This was the logo concept for the project"[1], but this project does not actually seem to exist (at least not in any public manner).
As such, why not just leave the logo of Tox in peace? Especially since it's a FOSS project with noble goals (even if they have yet to reach those goals, which is not surprising considering how early in the development the entire project is) and not some commercial entity intending to profit off of it.
[1] http://swapped.cc/#!/logotypes
Hamachi was created by Alex Pankratov. Once LogMeIn purchased Hamachi, they ruined it with the following update (either purposefully or accidentally) by making it no longer work with a large handful of older games. That sanfu in combination with a more bloated UI, forced LogMeIn account, and a splattering of useless features made it obsolete within a few months. It was the fastest rise and fall of a piece of software I have ever personally witnessed. You can read about the original Hamachi on the author's website here: https://swapped.cc/#!/hamachi
Check out "Selectivity for HN"[1]. It's manual, but situations like these are rare enough (for now...) that it's not too much of a hassle to block stories yourself. I probably would've stopped using HN if not for it - the site is basically completely dysfunctional on days like this, particularly if you don't agree with the majority views on "hacker politics" topics.
[1]: http://swapped.cc/#!/iip
Though not what it's designed for, halloc[1] Is similar to what you are talking about; if each function manually allocated its locals with halloc, and used the parent function as the parent allocator, then you would get an unbroken tree, and would free all the children upon returning from the function that had called setjmp().
[1] http://swapped.cc/#!/halloc
Hamachi was amazing, one of the best, most focused apps I've ever used. We were kids but it was still easy to use. Then they were bought by LogMeIn and was killed unceremoniously.
Also, it's old but not 90s old: https://swapped.cc/#!/hamachi released in 2004 actually.
Talloc borrows the block hierarchy idea from halloc and extends it with destructors and some fluff. So if you need just the hierarchy, take a look at http://www.swapped.cc/halloc
EDIT - https://github.com/apankrat/halloc too