Maybe this one ? https://www.pivpn.io/

• Skiff = Notion now, I doubt that it will be open source, but happy to see source code.
• Lavabit open source ? Where’s the code ?
• Roundcube is webmail software, not a webmail provider.
• Mailpile is email software for desktops, not a webmail provider.

“helped” is very misleading. Companies can’t refuse to provide information they have when served a search warrant / court order. These companies DID NOT choose to provide the info on their own.

You are suggesting all these companies are completely helpless against legal requests. That is not correct. A company should first make clear that the legal request is actually completely legitimate and correct. After that they can look at whether they should provide the information or not.

See the data here :

• https://restoreprivacy.com/protonmail-discloses-user-data-leading-to-arrest-in-spain
• https://cdn-resprivacy.pressidium.com/wp-content/uploads/2024/05/Proton-Mail-logs.png