Offering support for almost all the titles, Snes9x is the best Emulator for devices with low-end hardware.
I haven't used Parallels, but it used to come for free with a new Mac. The easy to use SNES Emulator is designed to launch games quickly, which eventually gives you the best gaming experience. I don't use VMware (I like the free stuff), but I've heard good things about it. This one is somewhat confusing to download I think you have to compile the emulator by hand. As with anything Apple-related, it should be pretty straightforward. I haven't actually installed it on a Mac, I've used a friend's computer, so I can't help you with installation. I would recommend Boot Camp for 3D stuff. RetroArch is a program that acts as a hub for all your emulation needs. Different types of OS, like Windows, Mac, and Android, are pretty compatible with the emulators. RetroArch without a shadow of a doubt is the best SNES emulator available for all platforms. Boot Camp (Free) - Comes with all Intel Macs List of SNES Emulator: Super Nintendo Emulator for PC, Mac and Android. It allows multiple operating systems to run on your computer.
iTerm2 is our pick for the best terminal emulator for Mac OS X thanks to. Virtualbox is not quite as lightweight as Q. Mac OS X includes a great terminal editor, but among the handful of alternatives is one that easily rises above them all. It supports emulating x86, x86-64bit, PPC PowerMac, PPC PREP, SPARC32, MIPS, and ARM processors. Oddly enough, it runs on PPC Macs, in addition to Intel Macs. Q is a great lightweight CPU emulator for OS X. Professionally supported enhancement of Wine Q (Free) Wine (and Crossover) do not require an actual copy of Windows installed on your machine. To add to the fun, it uses a cycle accurate hardware emulation. To that end, it does not include any game specific hacks, or idle-loop skipping optimizations commonly found in other emulators. I would recommend Winebottler, a free binary installer that also allows you to turn a Windows executable into a simple application that launches in X11. BSNES has a somewhat different purpose to most emulators it focuses on accuracy over performance.
You do need to install the Developer Tools, included on your computer's install disc. I would also not recommend compiling it yourself. One of the best qualities this emulator offers is that users can choose resolutions of up to 8192×8192. I don't know how well it works with 3D stuff. The emulator is available on Windows OS, Linux, and even Mac. I highly recommend Wine, which allows for running Windows applications without actually emulating the whole Windows OS. When using the term "emulator", it is important to distinguish between something that acts like Windows to applications (like Wine/Crossover) and something that acts like a PC to Windows (most of the other solutions) so that Windows can be installed.