[oersted]

It is somewhat old-school, but Gephi is by far the best graph visualization tool I've used that stays robust and usable at such scales (at least ~10M, but possibly a lot more).

[seinecle]

And work is underway to help Gephi handle larger graphs:

https://gephi.wordpress.com/2024/06/13/gephi-week-2024-peek-...