Boxcryptor is described as 'Easy-to-use encryption software optimized for the cloud. It allows the secure use of cloud storage services without sacrificing comfort' and is an app in the security & privacy category. There are more than 50 alternatives to Boxcryptor for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Boxcryptor alternative is Cryptomator, which is both free and Open Source. Other great apps like Boxcryptor are VeraCrypt, TrueCrypt, Tresorit and Picocrypt.
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.
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.
[TrueCrypt is not exactly "Open Source", but the source is available. See the reviews to get more information.]
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.
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.
Unify all your storage. odrive makes it easy to access, sync, and share all your files from one place. Integrations to 20+ services, desktop sync, CLI (inc. Linux), placeholders, zero-knowledge-encryption, web client, advanced sharing, and more.
AstraCrypt - is a free, powerful and open-source encryption app that has everything you need to keep your data safe and secure.
Easily encrypt files with user-friendly software using the powerful AES standard for security on Windows, macOS, and Linux, featuring robust 256-bit encryption for safeguarding sensitive data from unauthorized access, ideal for secure data storage, email transmission, and internet uploads.
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.
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.
Multron File Guardian - A File Encrypter/Decrypter With Many Encryption Algorithm.
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Boxcryptor is proprietary and costs money. Cryptomator is open source (you can check that it's implemented correctly) and it is free. Moreover, it works on Linux, which Boxcryptor does not. Cryptomator is excellent and basically a Boxcryptor killer. Mobile versions are in beta/soon ready.