On a related note, does anybody remember that circa pets.com there was an online web site that did shear and moment envelopes for steel joists with various loads? I thought it was an N. J. Bouras tool? This was web based, not the MS-DOS thing that Vulcraft had for a while.
I'd also mention the Alex Tomanovich series of spreadsheets that circulated on steel-tools and a few other websites, some more general (wind loading) others more steel focused, but a large set of spreadsheets.
The "problem" with all these idealistic one guy startups is that they are either way too specific to odd situations, or there's zero visibility (so nobody knows about it), and usually it's in something obscure like Perl or Python. And it never builds on something or expands an existing toolset and it doesn't connect or interact. Everybody keeps inventing the wheel in a new programming language, etc.
I've looked at OpenSEES but it's not anywhere near what I actually could use (I don't need multistory seismic load-step or whatnot, talking straight linear elastic analysis, mostly wood-frame, member selection and load inputs. BASIC.) And the user input feels very much like Staad 2000. Like it's almost punch card level.
As a result, I build my own, keep them on my local personal computer up to date, and if they wander off, they are eventually out of date and poorly documented anyway, with no support. Somebody wants to use a stolen tool with no documentation, that's on their ethics and liability. I forget if I use Excel 2010 or 2000. I think it's 2010. Got a copy for $40 with Office through an employer some time ago.
I don't do anything too fancy with it, It's advanced to the point that others can't readily penetrate the logic (being a sole proprietor this is not a concern), but it does have a flow, and the calculation set is reasonably complete. I had some really cool automation working for about five minutes, sending data and retrieving answers from USGS, ATcouncil, etc, for loads, and then everybody changed their website. But it did work for a while, all from an Excel Macro.
There are still bells and whistles I'd like to add, and I maintain a change log so I know where it was used if I find an error I can track it backwards to check any designs I used it on, but it is serviceable. It's very text based and you have to know where the inputs are, but it works for me because I built it and I know how it works, and all the guts are on display, so when things go haywire it's a breadboard and I can figure it out. It's a monster, however, as I put in a ton of images and Excel stores them terribly. So when I open it (which is rarely nowadays as I do mostly non-design work), the computer fan spins up like it's getting ready to launch off an aircraft carrier.
I remember using MathCAD and liked it, but when you use it for stability calculations (this was Grad school) at the time you had to manually iterate. Disliked. Not relevant anymore, either.
I will take a look at the Bach website, maybe making an interactive drawing would be a fun thing to learn.