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MeshCentral
A complete web-based remote monitoring and management web site. Once setup you can install agents and perform remote desktop session to devices on the local network or over the Internet.
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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.
If you're willing to host it yourself, meshcentral is my first choice. It's developed by a (small) team at intel, can run on minimal hardware (or cloud npm contianers), and supports both windows, linux and OSX. Also it's open source and free.
Try rustdesk for a free/opensource/self-hostable option