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paimon-moe
Your best Genshin Impact companion! Help you plan what to farm with ascension calculator and database. Also track your progress with todo and wish counter.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Also, for the ascension materials, you can use websites like Paimon Moe or Amber to learn more about it. Or you can press the star shaped icon on the character screen above the part where it shows the stats.
In addition to what people have already mentioned, I will point you out to a cool little page that can calculate exact probabilities for specific artifact types and even substat mixes. The probabilities used are as given in the wiki.