I am the creator of the BEM File Editor, a modernized editor for EnergyPlus Input Data File (IDF) files that can view building geometry, node connections graphically, run simulations, and more.
The software is free and open-source software using a BSD-3-Clause license, which is similar to the license EnergyPlus uses. The code is available from the GitHub repo.
If you're asking yourself why someone would make this software for free, the answer is I work as an EnergyPlus consultant and people using my free editor is excellent advertising for both my EnergyPlus and programming capabilities.
If you need EnergyPlus modeling for a project, support learning EnergyPlus, or as needed technical assistance, please don't hesitate to contact me with my email listed to the left. You can also visit my BEM Instructionals company website.