The best open source alternative to Cryptomator is VeraCrypt. If that doesn't suit you, our users have ranked more than 50 alternatives to Cryptomator and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Cryptomator are Rclone, GnuPG, Picocrypt and Cryptsync.
gocryptfs uses file-based encryption that is implemented as a mountable FUSE filesystem. Each file in gocryptfs is stored one corresponding encrypted file on the hard disk. The screenshot below shows a mounted gocryptfs filesystem (left) and the encrypted files (right).
AstraCrypt - is a free, powerful and open-source encryption app that has everything you need to keep your data safe and secure.
Syncany is an open-source cloud storage and filesharing application. It allows users to backup and share certain folders of their workstations using any kind of storage, e.g. FTP, Amazon S3 or Google Storage.
EncFS provides an encrypted filesystem in user-space. It runs without any special permissions and uses the FUSE library and Linux kernel module to provide the filesystem interface. You can find links to source and binary releases below.
Multron File Guardian - A File Encrypter/Decrypter With Many Encryption Algorithm.
Picocrypt NG (new generation) 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 file encryption, with a focus on security, simplicity, and reliability.
zuluCrypt is a free hard drives encryption, supports PLAIN dm-crypt, LUKS, TrueCrypt, VeraCrypt, and Microsoft’s BitLocker volumes. Currently Linux only.
Encrypt your programs easily and in real-time with cppcryptfs while using Windows. After creating your initial settings in the create tab just mount a virtual partition on your system in the mount tab. There all your files will be viewed normally, but when you close the program...
Basically Windows version of Gocryptfs, which is one of the best alternative for EncFS. Cppcryptfs is in early stage of development (as of 2021) though.
Tella is a mobile app designed to protect human rights defenders, advocates, and journalists by encrypting and hiding their sensitive data and safely uploading it to their organization's server.
Ukraine
Germany
EU
Türkiye
Speed and file system compatibility are excellent. Security and reverse mode are top notch.