Wammu is an Open Source mobile phone manager that works with many phone models.
Site: https://wammu.eu/wammu/
New: Audacious (June 1, 2023), Platform 25.0 (Apr 07, 2023)
New Apr 14: macOS Portable Drive Support
450+ real apps (49GB), 1.1 billion downloads, Please donate.
Wammu is an Open Source mobile phone manager that works with many phone models.
Site: https://wammu.eu/wammu/
For any developers looking at this now or the future, at present Wammu does not ship a Windows binary. They ship the raw Python code and require python-gammu, Python and wxPython installed locally for it to run. It may be possible to bundle these together as I do with gPodder Portable so that could be looked at as a starting point.