Packages with the tbb use flag

dev-games / ogre : Object-oriented Graphics Rendering Engine

When USE=threads, use tbb for threading

media-gfx / blender : 3D Creation/Animation/Publishing System

Use threading building blocks library from dev-cpp/tbb.

media-libs / embree : Collection of high-performance ray tracing kernels

Use TBB instead of the built-in Embree tasking system.

media-libs / opensubdiv : An Open-Source subdivision surface library

Enable multithreading with the Intel Threads Building Blocks through dev-cpp/tbb

net-p2p / airdcpp-webclient : Cross-platform Direct Connect client

Enable support of the TBB library to improve performance

sci-libs / opencascade : Development platform for CAD/CAE, 3D surface/solid modeling and data exchange

Enable multithreading with the Intel Threads Building Block dev-cpp/tbb

sci-libs / spqr : Multithreaded multifrontal sparse QR factorization library

Enable multithreading with the Intel Threads Building Block dev-cpp/tbb

sci-libs / suitesparse : Metapackage for a suite of sparse matrix tools

Enable multithreading with the Intel Threads Building Block dev-cpp/tbb

sci-libs / trilinos : Scientific library collection for large scale problems

Add support for threading building blocks library (dev-cpp/tbb)

sci-libs / vtk : The Visualization Toolkit

Use dev-cpp/tbb to handle smp support

sci-physics / bullet : Continuous Collision Detection and Physics Library

Enable multithreading with the Intel Threads Building Block dev-cpp/tbb

sci-physics / geant : Toolkit for simulation of passage of particles through matter

Enable support for dev-cpp/tbb

sci-physics / root : C++ data analysis framework and interpreter from CERN

Enable implicit multi-threading (IMT) with dev-cpp/tbb

sys-cluster / hpx : C++ runtime system for parallel and distributed applications

Use dev-cpp/tbb for memory allocation