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Barely anyone uses Merkaartor, but the project is not entirely dead; it seems to receive some updates.

https://wiki.openstreetmap.org/wiki/Editor_usage_stats

Just curious, how much of those editors (except Merkaartor) are NON JavaScript/Java-based?

Vespucci for Android also works in general, I heard good things about "Go Map!!" for Apple devices.

Potlatch 3 is also existing but I never used it.

level0 may be ridiculous to mention, but it is actually useful and in some cases more powerful

To answer the question: no.

OpenStreetMap is constantly evolving in many dimensions. A fully fledged editor requires a significant investment to remain current (think at least one FTE).

I preferred Merkaartor to JOSM when I was using them.