I use GnuCash for two companies and personal accounting. Love it.
I use fish shell only now. Used to only write bash, but I've started writing some fish scripts. I wouldn't try to plan too much WRT shell scripting up front. Just fix your pain points as you go.
Element/Matrix
I do the same. Using VPN, proxy, Firefox container, tracker blocking, the whole 9 yards. I haven't seen price change based on location/purchase history. I've been looking for signs of this for a while. Prices do fluctuate quite a bit though. The site might have auto-selected a different "ships from" option for you, depending on how you're logged in.
I followed up with customer support. They said go ahead with the order and they will refund me the amount after. They gave me a $5 credit for my trouble. They said they would escalate this issue to the development team.
I only needed one more item to "unlock extra savings up to 15%", so I added an extra item to see what the savings would be. I didn't think the savings matched what was advertised, so I removed an item to see what the difference was (making sure to screenshot before/after this time). Turns out the price of 3 out of 4 items is the same after an extra 5% discount.
Street address data isn't available for the US. I find the POI in Google Maps in Firefox and then go to Share and open the coordinates in Organic Maps or OsmAnd.
I use emacs, Denote, and markdown-mode to keep a loose Zettlekasten archive of notes.
Been using Gnucash for about 10 years for personal finance and 2 small businesses. Highly recommended!
I use and recommend Free File Fillable Forms. https://www.freefilefillableforms.com It's basically filling out an electronic version of the paper forms, but some fields are auto-calculated.
I noticed that some of these are apps and some are protocols. It makes sense to list the app if the protocol is proprietary, but it's confusing that there can be multiple apps for an open protocol and not all of those apps could feature the same level of privacy.
Nice work. Can you add RCS to the table? https://en.wikipedia.org/wiki/Rich_Communication_Services
Are you eating enough healthy food? I used to have some periods of lethargy and depression caused by an inadequate diet.