I believe in privacy and secure software. If you believe in software that doesn't abuse its users and sell their data then here is a list of apps and services that you might be interested in:
Email: Tutanota- Tutanota is a secure zero knowledge end-to-end encrypted email service at a reasonable price. In second place I would recommend
Instant Messaging: Wire- Wire is a cross platform instant messaging app that is end-to-end encrypted. It does not rely on play services on android and syncs up your conversation across multiple devices. They make their money from making a slack competitor rather than selling your data. Honourable mention goes to Signal which is very similar in its security but relies on play services on Android and cannot sync your conversations.
Cloud storage and sync: Tresorit- Tresorit is a Dropbox competitor except that it cannot read your files as they are end-to-end encrypted. The price is a little high for this one but it does the job well and is fully cross platform. If sync.com had a Linux client they would be my recommendation and are slightly cheaper.
Password Manager: KeepassXC- Keepass is widely regarded as the most secure password manager as your password database is very heavily encrypted and not stored on a cloud infrastructure but rather on your devices. There are numerous different open source front end apps apps that can open the database, my favourite of which is KeepassXC.
For more information on different services feel free to check out this site: https://thatoneprivacysite.net/
