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Drop-down terminal: Kitty - Drop-down achieved using Zellij, a bash script and Wayfire
An IRC client is just a chat app using the IRC protocol. As for btop with GPU, you'll need to use a version compiled with GPU support enabled. If you're using Arch, you can install the btop-gpu-git package.
Bottom screenshot good example of why twm is not useful in this usecase. Also due to exaggerated use of gaps you are wasting screenspace, which is the opposite of what a twm actually is trying to do.
Vesktop seems interesting, going to check it out, thanks for mentioning.