Skiff Mail - An end-to-end encrypted inbox that keeps your messages private to you. Add multiple aliases, use custom domains, and import existing email for an even more powerful inbox. Easily migrate from Gmail, ProtonMail or Outlook.
Skiff Pages - Write, share, and upload end-to-end encrypted documents and notes on Skiff Pages. Jump directly from your inbox to a full collaborative suite, including powerful tables, in-page embeds, and real-time collaboration.
Skiff Drive - Upload, import, and share end-to-end encrypted files of all types. With 10 GB of free storage, Skiff helps you transition from other online cloud storage providers to a fully private storage platform, where your data is owned by you. Users have the option to store all Skiff Drive files on a centralized server on the cloud or the IPFS decentralized network
Skiff Calendar - Protects your personal and professional life by keeping your schedule end-to-end encrypted.

Here's the ref link which gives extra 500 MB storage - https://app.skiff.com/signup?mail&referral=skiffor

Non-ref link - https://skiff.com/