CVFEM-Rift2D
A computational package based on Control Volume Finite Element Method (CVFEM) (http://www.ees.nmt.edu/outside/courses/hyd547/lectures/Lecture7/CVFEM_March5_2013.pdf) that solves displacements, stress disturbances, and hydraulic heads in response to continental glacial loading in a 2D plane strain cross section. It is developed by Prof. Vaughan Voller (https://voller.cege.umn.edu/), Prof. Mark Person (https://www.nmt.edu/academics/ees/faculty/mperson.php), and me (Yipeng Zhang) as part of this NSF project https://nsf.gov/awardsearch/showAward?AWD_ID=1344553
It is an open source package and available at https://github.com/csdms-contrib/CVFEM-Rift2D ,and it is documented in details here https://agupubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1029%2F2017WR022464&file=wrcr23548-sup-0001-ZhangPerson_WRR_Supplemental_FormattedMerge_06022018.pdf
FloPy
A python script based package to create, run, post-processing MODFLOW-based (MODFLOW, MT3D, SEAWAT, etc.) models, becoming more popular these days...
Groundwater Modeling System®
A graphical user interface based commercial software developed by Aquaveo, an engineering modeling software company based in Utah. It can create 3D numerical models for groundwater flow and solute transport in a speedy and simple way, especially for projects with tight deadlines
https://www.aquaveo.com/software/gms-groundwater-modeling-system-introduction
The Stanford Geostatistical Modeling Software (SGeMS)
An open-source computer package for solving problems involving spatially related variables. It provides geostatistics practitioners with a user-friendly interface, an interactive 3-D visualization, and a wide selection of algorithms.