You can do all that for ages with WiiBackupManager and it can also transfer the games directly to your destination and place them in the correct folder structure required by usbloaders and many more. And it is portable, no installation required. It is trusted by many users here.
The Wiimm's tools is the tools provided by the creator of the wbfs format although its a commandline program. There are GUIs developed for it and WiiBackupManager is basically base on it.
Never heard of isotowbfs either. Maybe we are too old or too contented to search for new tools.
It was a quick solution that I needed for a small problem, but here is the answer to that last sentence:
I was never really a part of the wii homebrew community, and only ever found out about it from a wikihow tutorial on custom guitar hero songs. I've been much more active in the 3DS one, though. Knew about homebrew from wii, thought I might get interested from it with my 3ds, and so on, since I actually used my 3ds somewhat actively.
The wii homebrew was more of "i'm bored, and since the wii is one of the only two consoles I have, and I've been a huge fan of guitar hero for years and years, and since I almost never use it, I might as well get some use out of it and find out how to make custom songs, or I wouldn't have much to lose." (I also learned about project M from it, and now I use it all the time for SSBM.)
But then again, it reeled me into homebrew and these homebrew communities, and now I have a fully modded Old3DSXL that does everything I need it to. I did also learn quite a bit from modding my wii, enough to mod another one to the point where I was able to fully replace it for my house so my sibling could use it while I had the other one.
But in the end, This scene is beyond my time and my needs. The 3ds still has some fuel left in it, but I am looking forward to the switch and what it has to offer.