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diagrams.net
Plan out your next project with the help of diagrams.net. It's open source and you can decide where to store your data.
Free (?)
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fabform.io
Fabform.io is an intelligent forms backend for handling HTML forms on static websites. Collect form submissions, reduce form spam, send form to email notifications.
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Web Formatter
Format your HTML, CSS, XML, PHP, and JSON files to comply with popular formats.
Free (?)
