We have listed 5 alternatives for Cryptomator which have similar features like
Cryptomator
including commercial, freemium, free and open source Linux
alternatives.
EncFS is a Free (LGPL) FUSE-based cryptographic filesystem. It transparently encrypts files, using an arbitrary directory as storage for the encrypted files.
VeraCrypt is an open-source utility used for on-the-fly encryption (OTFE). It can create a virtual encrypted disk within a file or encrypt a partition.