the Linux Software for Chenistry site especially indicates that various quantum chemistry programs are written in C, Java, Python, and Fortran.
http://en.wikipedia.org/wiki/List_of_quantum_chemistry_and_solid_state_physics_software
http://www.redbrick.dcu.ie/~noel/linux4chemistry/
Linux Software for Chemistry
http://www.openmolgrid.org/?m=5&s=faq#05
OpenMolGrid runs on Java
http://www.pdynamo.org/mainpages/
pDynamo is an open source program library that has been designed for the simulation of molecular systems using quantum chemical (QC), molecular mechanical (MM) and hybrid QC/MM potential energy functions. pDynamo is written in a mixture of Python and C and complements the existing version of Dynamo, now denoted fDynamo, that is written in Fortrans 90 and 95.
http://homepages.nyu.edu/~mt33/PINY_MD/PINY.html
(Linux For Chemistry links to this and indicates it is written in C, viz🙂
PINY_MD Molecular Dynamics, Quantum Mechanics Common Public License, C
PINY_MD is capable of performing a wide variety of molecular dynamics, electronic structure, and geometry optimization calculations. Such capabilities include force-field based simulations on system ranging in complexity from simple molecular liquids and crystals to large biomolecular systems. In addition, PINY_MD can perform ab initio molecular dynamics and geometry optimization using plane-wave based generalized gradient (GGA) density functional based representations of the electronic structure combined with the Car-Parrinello propagation scheme.
http://pyquante.sourceforge.net/
(Linux For Chemistry links to this and indicates it is written in C, viz🙂
PyQuante Quantum Mechanics BSD, (Python, C)
PyQuante is an open source suite of programs for developing quantum chemistry methods, written in the Python programming language, but with many rate-determining modules written in C for speed. The resulting code is easy to understand and modify, providing a well-engineered set of tools so that scientists can construct their own quantum chemistry programs without going through the tedium of having to write every low-level routine.
Originally posted by zeeblebotOK. So there are some. But I don't think these have as many professional scientific users or that these have resulted in published scientific output as much as the ones I mentioned.
the Linux Software for Chenistry site especially indicates that various quantum chemistry programs are written in C, Java, Python, and Fortran.