Linux

I really like Asbru and have been using it for a couple of years. I used Remmina for a little while but never liked its look and feel.

Not too much active development has been going on lately, sadly, but the latest version still works very well.

https://www.asbru-cm.net/

I would say, like many others, Remmina.

Putty also has a Linux version, so you can use that as well. Its session management is a bit clunky, but it works and it offers some fairly good functionalities.

But ssh is first and foremost a command line tool. As others have said, invest some time to learn its commands and configuration files.

I use Apache Guacamole, which works great for just about any kind of remote access and has a dead simple to use Docker Container.

It supports folders, copy/paste, uploading/downloading files, multiple open connections at once, and alternative mouse modes for touch screens. Best of all, it's completely free and open source.

Remmina proves a reliable solution for remote desktop access when a graphical interface is required. However, for more streamlined operations, terminal-based SSH access ssh username@remote_host remains the preferred method. Establishing passwordless authentication is, naturally, a matter of convenience. The command ssh-copy-id username@remote_host facilitates this process. It’s a rather elegant solution, isn't it? A testament to the power of minimalism.

SecureCRT. Expensive but my work paid for it.

Not a GUI, but I keep my ~/.ssh/config clean by splitting my configs into folders, and including them in the main ~/.ssh/config.

I have the folder, ~/.ssh/config.d/, and here's what it looks like:

~/.ssh/config.d
.
├── work
│   ├── dev.config
│   ├── staging.config
│   └── prod.config
└── server
    ├── development.config
    ├── containers.config
    ├── home.config
    ├── pis.config
    └── server.config

Then my ~/.ssh/config looks like this:

Include config.d/work/*
Include config.d/server/*
Include config.d/other/*

Rustdesk? Guacamole?

Use Tabby. It is, by far, the closest to a Linux terminal experience. Likely because it's cross platform. I say this as someone that absolutely despises Windows terminal experiences.

I just install my keys as needed to the machines and then configure aliases for quick connections. For file transfer with SFTP I'm using Filezilla because its queuing functionality and site management are nice.

I think for what you are looking for, both puTTY and Remmina should be capable as well as the other options suggested here

If youre on windows, mremoteng is very comprehensive: https://mremoteng.org/

I just use ~/.ssh/config

e.g.

Host website
    Hostname some.hostname.foo
    User bob
    Port 1500

Uh, I just type ssh or rsync into the terminal and that's it. It's a manageable amount of computers/servers I connect to, so I can remeber their names. Regular ssh stores all the keys or custom ports / IPs in its config. What's the advantage of using some manager?

I'll be watching this discussion, as I'm currently using Remmina. It meet the bare minimum of SSH & RDP, but it doesn't have a clear method to organize connections and instead uses a big list. I also find the interface a tad counterintuitive, so maybe I'm just using it wrong.

It also seems to have a bug where it launches twice whenever I start my computer. So I have to close one.

Termius?

~~Mobaxterm~~?

Stupid windows only.

ssh config? Not sure what you're looking for. Like a list of preconfigured connections?