Good one from back in the day (not mine): "In a world without walls and fences, who needs Windows and Gates?"

"For slogan, please refer to the according man page"

more seriously maybe "Software it your own way"

Linux. The Power of the Community.

I didn't come up with it and the picture is not mine. I just found it on the internet earlier.

"Your Computer".

Yours to make, yours to break.

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"I didn't want to play that game anyway."

It is in fact GNU/Linux.

Its not windows

"It's terminal"

It's a headache but it's your headache.

Join a Movement, not a Marketplace

Free as in beer

Hurts So Good

"It just works"

..because that is the state of a mainstream modern distro, and it's not true of Windows anymore.

Alternatively "No nagging, no forced online account."

Two out of 10 Linux users agree that insert name here is the best distro

"We hope you like config files"

"Own your computer" and "Free your computer"

Own your Computer

The least annoying launcher for your web browser

"It does exactly what you tell it to do."

With a bit of a double-entendre, "It powers the world", since it's the most common server platform.

More funny: "It's not an OS. It's a hobby."

Have it your* way.

*your way may involve several hours of configuration

Linux, when you want to tell the computer to shut the fuck up and just do it's job.

Batman runs Linux. Shouldn't you?

Sovereign Computing

Buy it, own it.

It’s yours.

Live, Laugh, Linux

“If you knew what it was, you’d be using it already.”

I'd just like to interject for a moment. What you're refering to as Linux, is in fact, GNU/Linux, or as I've recently taken to calling it, GNU plus Linux. Linux is not an operating system unto itself, but rather another free component of a fully functioning GNU system made useful by the GNU corelibs, shell utilities and vital system components comprising a full OS as defined by POSIX.

Many computer users run a modified version of the GNU system every day, without realizing it. Through a peculiar turn of events, the version of GNU which is widely used today is often called Linux, and many of its users are not aware that it is basically the GNU system, developed by the GNU Project.

There really is a Linux, and these people are using it, but it is just a part of the system they use. Linux is the kernel: the program in the system that allocates the machine's resources to the other programs that you run. The kernel is an essential part of an operating system, but useless by itself; it can only function in the context of a complete operating system. Linux is normally used in combination with the GNU operating system: the whole system is basically GNU with Linux added, or GNU/Linux. All the so-called Linux distributions are really distributions of GNU/Linux!

Wobbly Windows in a Windows-less World

Jokingly: "Linux is free if your time is worthless"

Though this tongue-in-cheek tagline takes the "free as in free beer" misinterpretation of the term "free software", I've always found it a fun way to describe the time investment you'll need to make if you've spent your whole life using Windows before making the switch.