STXXL: Standard Template Library for Extra Large Data Sets.

The core of STXXL is an implementation of the C++ standard template
library STL for external memory (out-of-core) computations, i. e.,
STXXL implements containers and algorithms that can process huge
volumes of data that only fit on disks. While the closeness to the
STL supports ease of use and compatibility with existing applications,
another design priority is high performance.

WWW: http://stxxl.sourceforge.net/