Linux

xpipe – I use it to SSH into any of my servers, cluster nodes or directly into docker containers without having to remember hostnames, IPs, users. It can also bring your useful scripts to said ssh session without "installing" them on the target device, which is great because you don't have to set it up for every new server. Also the dev is a really nice guy.

Portmaster + SPN – I use it to route each app through different VPN paths with multihop support and per app firewall rules. (e.g. one app via Denmark, another via a random country, third app no VPN, fourth app gets no internet at all etc.) It really gives you full control over the traffic. afaik there is no other all in one app like this.

wdfs - It's an old project that is patched by this random github user. It's the only way I found to mount a webDAV storage cleanly into a directory from a bash script without fucking with my fstab or being root or giving specific privileges to my user. I mount it from a bash script because that way I can use KDE wallet to store the credentials instead of having a plain text file somewhere on my fs, the script waits until the wallet is unlocked, then reads the credentials from it and mounts the webDAV to a path in my home. That is more accessible to apps and other scripts (e.g. recent files) instead of doing it via Dolphin, which generates a random string in the path every time when opening network storage.