Most physics professionals use LaTeX for document preparation. Highly recommended free editors include TeXstudio or Overleaf (online).
If you need to edit PDFs or documents related to physics, consider free, safe alternatives like LibreOffice or PDFsam . MIT-LCP/physionet-build - GitHub
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You should download it directly from the official CodeAndWeb PhysicsEditor page . It is usually distributed as an .exe (Windows) or .dmg (macOS), but you may find archival versions or project files in .rar format on community forums.
If "Physics Editor" refers to a tool for writing or editing physics-related papers or data:
If you are looking for a tool to edit physics bodies for 2D or 3D game engines (like Cocos2d-x, Unity, or Corona SDK), the industry standard is by CodeAndWeb.