The best alternatives to Imagin are Shape.so, Heroicons, and NucleoApp. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— The most accurate API for conversational speech-to-text
A premium library of 20000+ vector icons organized in 30 categories, and a powerful application to collect, customize and export all your icons in different formats such as SVG, icon fonts and JSON files.
Basicons is a curation of basic icons for product design and developement. Designed with care & precision. Updated & refined weekly. Basicons is designed on a 24x24 grid, with the strokes intact for high customization.