OptimoRoute might be a bit more popular than GPSBabel. We know about 1 link to it since March 2021 and only 1 link to GPSBabel. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
The output is KML and GPX (we assume folks can convert to other formats as needed using apps like GPSBabel - gpsbabel.org). Source: over 2 years ago
Have you tried using an existing tool such as OptimoRoute? (no affiliation, I know the founders). Source: over 2 years ago
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GPX Editor - Load, modify and save your GPX 1.1 files.
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