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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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ZudVPN
A mobile application to deploy private VPN servers in the cloud with DNS ad-blocking and other features
Hi! I'm one of Mullvad's founders.
I can't speak for Mozilla, but we have our own desktop and mobile apps because it enables us to do more privacy-preserving things with a higher assurance. Consider for instance DNS leaks, Teredo leaks, IPv6 leaks, esoteric DHCP directives that can hack your routing tables, and so on.
And these are just a few of the things we were early in mitigating correctly. Consider also the tight relationship between UX and security, and it is clear that we can't rely on "generic VPN clients" to always agree with our design and security preferences. That doesn't mean they are wrong and we are right of course. It's just that we have a very specific mission.
One architecture decision we made for our app was to write its backend in Rust, and integrate tightly with the firewalls on Windows, macOS, and Linux. It facilitates stability and therefore reduces the risk of states where data leak outside of the tunnel. Check it out, it's open source. As all security-related things should be.
https://github.com/mullvad/mullvadvpn-app
They still have scripts for generating configs manually -- maybe not NetworkManager, but I use it on a server to establish a wireguard tunnel.
https://github.com/pia-foss/manual-connections
