The best alternatives to Sharelatex are MDWA, Flowstate, and Collabio® Spaces for macOS. If these 3 options don't work for you, we've listed a few more alternatives below.
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Notion— Get over $6,000 worth of Notion + unlimited AI, for free
Comprehensive office suite for editing documents on iOS and macOS devices. Need more? Off-line real time co-authoring (no servers, no clouds, no Internet) paired with slick document arrangement in spaces! Dive in to Collabio Spaces to learn more!
Superintendent.app is a Desktop app that enables you to write SQL on CSV files. No more vlookup. No more 1M row limit on Excel. It is fast and handles large file well (e.g. load 1GB file in 10s).