EVIO Software Package
EVIO stands for EVent Input/Output and contains libraries which read & write data in its own unique format. It was created by the Data Acquisition (DAQ) group and is now maintained by the Experimental Physics Software and Computing Infrastructure (EPSCI) group at Thomas Jefferson National Accelerator Facility (Jefferson Lab). There are C, C++, and Java libraries and utility programs as well.
Documentation
Here are links to the documentation contained in the github repository (although it may also be accessed at the home page).