There are a lot of websites offering online Megan-35 encryption/decryption. Surprisingly, I haven't been able to spot out any resources detailing the underlying algorithm. Can anyone provide any link to the Megan-35 algorithm itself?
The Megan-35 is an encoding and not and encryption. It is a variant of the famous Base64.
The first step to encode to Megan-35 is to encode in base64. Then for each letter in base64 you will translate this letter to another letter.
You can find a python code on a gist.