One issue is that when you send cipher text to a friend, it opens an email client that you don't use (eg: Outlook instead of Thunderbird). Go to the preferences of your web browser and change the default email client to one that you like.
Another issue is that when you receive a message, even when you decode it with the given key, the program gives you gibberish or "undefined". What happened is that the program does not support capital letters in the keyword, so if you decode a letter encrypted in capital letters, with capital letters, you will get a "undefined". If you decrypt it without the capital letters, you will get gibberish.
Yet another issue is when you click the encode or decode button in RSA, nothing happens. This is because you have not generated your keys, which must be generated after each reload.
If you find any issues or comments, such as broken links or malfunctioning Javascript, do not hesitate to send a email to me.