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Apache Answer
A Q&A platform software for teams at any scales. Whether it's a community forum, help center, or knowledge management platform, you can always count on Apache Answer.
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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.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Their Script
I really enjoy making documentations using Material for MkDocs (https://squidfunk.github.io/mkdocs-material/). Simply write Markdown inside a Git repository and deploy/build it using Material for MkDocs!
https://flowchart.fun is a good one if you're looking for something fast. (It's text-to-diagram)