Download SFML 2.1

Windows	Visual C++ 9 (2008) - 32-bitDownload9.80 MB	Visual C++ 9 (2008) - 64-bitDownload11.0 MB
	Visual C++ 10 (2010) - 32-bitDownload10.3 MB	Visual C++ 10 (2010) - 64-bitDownload11.5 MB
	Visual C++ 11 (2012) - 32-bitDownload11.5 MB	Visual C++ 11 (2012) - 64-bitDownload12.9 MB
	GCC 4.7 TDM (SJLJ) - 32-bitDownload15.0 MB	GCC 4.7 TDM (SJLJ) - 64-bitDownload41.0 MB
	GCC 4.7 MinGW (DW2) - 32-bitDownload10.6 MB
On Windows, choosing 32 or 64-bit libraries should be based on which platform you want to compile for, not which OS you have. Indeed, you can perfectly compile and run a 32-bit program on a 64-bit Windows. So you'll most likely want to target 32-bit platforms, to have the largest possible audience. Choose 64-bit packages only if you have good reasons.

Linux	GCC - 32-bitDownload1.35 MB	GCC - 64-bitDownload1.34 MB
On Linux, if you have a 64-bit OS then you have the 64-bit toolchain installed by default. Compiling for 32-bit is possible, but you have to install specific packages and/or use specific compiler options to do so. So downloading the 64-bit libraries is the easiest solution if you're on a 64-bit Linux.

Mac OS X	GCC - universal 32+64-bit (OS X 10.5+)Download5.63 MB
	Clang - universal 32+64-bit (OS X 10.8+, compatible with C++11 and libc++)Download5.93 MB
	Templates for Xcode 5Download1.16 MB
Mac OS X libraries are universal, they contain both the 32 and 64-bit versions of SFML and can therefore be used for both 32 and 64-bit builds.

All	Source codeDownload9.27 MB