The best open source alternative to Encrypto is Cryptomator. If that doesn't suit you, our users have ranked more than 50 alternatives to Encrypto and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Encrypto are GnuPG, Kleopatra, DroidFS and Multron File Guardian.
Cryptomator 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.
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.
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.
Multron File Guardian - A File Encrypter/Decrypter With Many Encryption Algorithm.
Use GPG Suite to encrypt, decrypt, sign and verify files or messages. Manage your GPG Keychain with a few simple clicks and experience the full power of GPG easier than ever before.
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.
GoFileEncoder is a little file encoder that uses the XOR encryption. It is coded in Golang, and is compiled for several OSs (Windows®, Linux®, and soon macOS®).
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Cryptomator is better than Encrypto because: 1) it's open source, 2) works on Mac, Linux and Windows, 3) you can use it to encrypt many files or just one. One of the best privacy-enhancing apps you can find.