One of my favorite is Kevin Marks’ Noter Live (open source) which is great for live tweeting and creating long threads quickly, especially at conferences. When you’re done, it’s kept a record of everything which you can quickly cut/paste as HTML into your website for an instant archive post.
Another option if your website supports the Micropub spec (perhaps with a plugin?) ThreadReaderApp recently added support to let you unroll the thread and you can go to your account and authenticate to your website and post the thread with one click.
I’ll also note that WordPress’ Gutenberg just added the ability to unroll threads to websites built with it as well.
In addition to general public use, these could actually be the backbone of an interesting journalistic live notebook for reporters in the field who could quickly compile/archive their threads for expanded articles later on.