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Please let me know (e.g. at [email protected]) if you know any? Preferably something that is in actual use by serious scientists.
Also let me know if you think any of these are in anyway sketchy and should be avoided in which case I shall remove them. (I can personally only vouch for SciPost being great.)
Math (seems to have many, see also this question in the same spirit as mine - which was allowed for some reason: https://mathoverflow.net/q/231206/131814)
Some examples: