DIY Oscilloscopes – List and Discussions

Hello, all crazy lunatics of DIY electronics! Me myself – I sure qualify to that description. Recently I got seriously addicted to DIY oscilloscopes. Different kinds of them, any level of complexity really. I was, and still am, collecting links, information, solutions, technical details. Trying already many of them. Why? Because it is addiction, and, feeding your addiction releases some “happiness hormones” into your brain, that’s why. I don’t really need oscilloscope as a tool. Have some decent ones at work, and not even using them that much. So, my point is – I have great fun finding DIY scopes projects and trying them.
Now, when I look at my bookmarks and materials I have collected to this topic, two things comes to mind. First – obviously, I am insane. But that’s okay, nothing new here. But second – hmm, lotsa work done collecting all that. So, I decided to share my findings, and encouragement from some authors and discussions participants helped, so that I am really doing it.
—–End of Lyrics ———–

Here I will maintain list of DIY scopes that I have found (and YOU will suggest) and considered interesting for one reason or another.
At first, I will post just list with, minimum (or none) descriptions. When I feel like it, I will add stuff, by editing and expanding original post.
Links to resources will be coded in groups. That, I imagine, will keep things a bit organized, and will help to reference to particular projects in upcoming discussions, if there will be any. For example, “I just tried S-03-(T) and it sucks enormously”. You got the idea.

GROUP CODES:
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S-xx “Simple”, projects that have some MCU and not much else, or some other very simple solution. I mean simple just hardware-wise, don’t ignore them. If some just one MCU has 4 internal ADCs working in tandem (“quandem”…? is that a word?), results might be pretty interesting.

M-xx “Medium”, usually it will be MCU(s) plus some external ADC(s), input buffers, etc, etc.

A-xx “Advanced”, those are where things got pretty serious, usually involving FPGAs and other esoteric magic.

N-xx “Not-Finished”, projects that looks very interesting, but are maybe not finished, maybe migrated to somewhere, maybe will come back, maybe we will find where is it now.

C-xx “Clones”, direct or semi-direct clones of commercial products. Copied, reverse engineered.

P-xx “Price”. Kind of DIY, but you can not really, well, DIY. Need to pay for something. I did want to name it “G” for “greed”… Still, there are some really interesting ones, and let’s hope we migrate them to “C”-category someday.
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NUMBERING
list numbers “xx” does NOT represent importance, coolness, bad-ass-ness, or anything, really. Just some number for reference. Except for “S-01”. But you will see why.
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SUFFIXES
(T) – tested by me. Not necessary in finished state, but somehow tested.
(RU) – source in russian language (i am latvian, but I also know russian and english).
(DE) – source in german.
(PL) – source in polish language.
(…) – maybe some other languages too.
For “T”-marked there usually will be link to some pics of my testing.

Okay, here we go:
=== LIST OF DIY OSCILLOSCOPE PROJECTS ===