qmol
A simple molecular weight calculator
...For Windows binary and source code see the files section: https://sourceforge.net/projects/qmol/files/
Binary packages (rpm/deb) for
openSUSE Leap 15.2-42.2, xUbuntu 20.10-19.10, 17.04, Fedora 33, CentOS 8, Scientific Linux 7, and Debian 10.0-8.0 can be found at: http://download.opensuse.org/repositories/home:/lineinthesand/