Apps similar to Tella include VeraCrypt, which is free and open source. Other options are Cryptomator, TrueCrypt, Axcrypt and LUKS. There's no shortage of Disk Encryption Tools like Tella, with more than 50 alternatives for Windows, Mac, Linux, Android and iPhone.
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.
A free and open-source file encryption software for Linux, Windows and Mac that encrypts/decrypts files so they can be stored securely, utilizing compression, Reed–Solomon Error Correction, encryption and keys derived from the user's password with Argon2id.
LibreCrypt (formerly DoxBox) is an open-source disk encryption for Windows and the successor of FreeOTFE
Encrypt files and folders with 256-bit AES, shred data irreversibly, compress files for more storage, securely manage passwords, protect removable drives, and safely transmit encrypted data, with support for Windows PCs and simple rapid encryption.
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FinalCrypt uses the most unbreakable encryption: "One Time Pad" Encryption and has a well designed graphical user interface and an equally advanced command line interface for large automations.
LUKS Manager provides on-the-fly encryption (AES by default) to virtual folders on Android devices.
This app eases the use of mounting (loading) encrypted partitions (also called Volumes), a disk drive may consist of several of those areas, usually represented by a drive letter.
Used for encrypting and decrypting files with 256 bit AES algorithm.
The realcrypt application in the RPM Fusion repo is an encryption application based on truecrypt, freely available at http://www.truecrypt.org/. It differs from truecrypt in only the following ways:
FileVault full-disk encryption uses XTS-AES-128 encryption with a 256-bit key to help prevent unauthorized access to the information on your startup disk.
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ProxyCrypt is a command line tool that creates encrypted volumes within a file or a hard drive.
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Digital Safe and Password management to protect your data and privacy.
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