Release of FastJet 3.1.2, 12 March 2015 (release notes). Maintenance release. Fixes a bug that in rare cases can lead to an infinite loop or crashes.

Main improvement of 3.1 series: speed gains between a factor of 1.5 to ten in the range between a few thousand and a few hundred thousand particles. More ⇓ Download
Latest stable release of fjcore (v3.1.2), 12 March 2015.
Lightweight access to the core FastJet functionality (PseudoJet, JetDefinition, ClusterSequence and Selector). It consists of just two files, fjcore.hh and, which can easily be included in 3rd party projects. Compile time: a few seconds. Download size: 70k.

v3.1.2 fixes an important bug that causes fjcore to fail when run with a large number (~1000) of input particles. All users of v3.1.1 should upgrade to this version.
Release of FastJet Contrib 1.016, 7 April 2015
A package of contributed add-ons to FastJet. Release 1.016 adds the ValenciaPlugin contrib (algorithms for e+e-).