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The eT program is an open source electronic structure package with emphasison coupled cluster and multilevel methods. It includes efficient spin adaptedimplementations of ground and excited singlet states, as well as equation ofmotion oscillator strengths, for CCS, CC2, CCSD, and CC3. Furthermore, eTprovides unique capabilities such as multilevel Hartree-Fock and multilevelCC2, real-time propagation for CCS and CCSD, and efficient CC3 oscillatorstrengths. With a coupled cluster code based on an efficient Choleskydecomposition algorithm for the electronic repulsion integrals, eT has similaradvantages as codes using density fitting, but with strict error control. Herewe present the main features of the program and demonstrate its performancethrough example calculations. Because of its availability, performance, andunique capabilities, we expect eT to become a valuable resource to theelectronic structure community.

eT 1.0: an open source electronic structure program with emphasis on coupled cluster and multilevel methods