Cryptomator is described as 'Provides transparent, client-side encryption for your cloud. Protect your documents from unauthorized access. Cryptomator is free and open source software, so you can rest assured there are no backdoors' and is a very popular file encryption software in the security & privacy category. There are more than 50 alternatives to Cryptomator for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Cryptomator alternative is VeraCrypt, which is both free and Open Source. Other great apps like Cryptomator are Rclone, TrueCrypt, GnuPG and Tresorit.
Ensure your data's security by encrypting entire partitions, storage devices, or system drives with VeraCrypt. Benefit from transparent and automatic real-time encryption, hardware acceleration on modern processors, and robust security algorithms that are resistant to brute-force attacks.
Rclone ("rsync for cloud storage") is a command-line program to sync files and directories to and from different cloud storage providers.
[TrueCrypt is not exactly "Open Source", but the source is available. See the reviews to get more information.]
GnuPG allows to encrypt and sign your data and communication, features a versatile key management system as well as access modules for all kinds of public key directories. GnuPG, also known as GPG, is a command line tool with features for easy integration with other applications.
End-to-end encrypted file synchronization and sharing on desktop and mobile, featuring admin controls, auditing, link-based sharing, two-factor authentication, offline access, granular permission management, and protection for sensitive workplace documents.
Picocrypt is a very small (hence Pico), very simple, yet very secure encryption tool that you can use to protect your files. It's designed to be the go-to tool for encryption, with a focus on security, simplicity, and reliability.
CryptSync is a small utility that synchronizes two folders while encrypting the contents in one folder. That means one of the two folders has all files unencrypted (the files you work with) and the other folder has all the files encrypted.
Gpg4win enables users to securely transport emails and files with the help of encryption and digital signatures. Encryption protects the contents against an unwanted party reading it. Digital signatures make sure that it was not modified and comes from a specific sender.
DroidFS is an alternative way to use encrypted overlay filesystems on Android that uses its own internal file explorer instead of mounting virtual volumes. It currently only works with gocryptfs but support for CryFS could be added in the future.
Offers robust file encryption with AES-256 for premium and AES-128 for free users, integrated password manager, intuitive interface, support for cloud storage, multilingual options, offline security, group management tools, and secure file deletion features.
Open-source, privacy-focused cloud storage using zero-knowledge encryption and blockchain technology, provides secure file transfer, end-to-end encryption, free 10 GB plan, desktop and mobile support, full user control, and no data tracking or ads.
Round Sync helps you to manage your files, everywhere you go, on your local device or on most cloud providers.
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Veracrypt is a program for creating an encrypted container in which you can hide files protected by various encryption algorithms. It is excellent and extremely useful, but not for syncing files to the cloud because files you change inside the veracrypt container won't be seen to change by an external sync program. Veracrypt addresses a different need to Cryptomator.