The best alternatives to Crypteron are Crypho, Virtru, and Ubiq Security. If these 3 options don't work for you, we've listed a few more alternatives below.
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We simplify encryption for developers. Encryption is hard to get right and easy to get wrong, that’s why we built Ubiq, an entirely API-based SaaS platform that enables developers to build encryption directly into their applications with a few lines of code.
Kryptor is free and open source file encryption software for Windows, Linux, and macOS. It is a portable, cross-platform command line tool that makes use of modern and secure cryptographic algorithms. It aims to be a simple, user friendly alternative to GPG.