Why don’t all AES encryption tools produce the same key from the same password?
There are two things here:


Encryption uses mode of operation, and not "AES alone". Some of them are randomized by an initialization vector - that means the encryption of the same text under the same algorithm is still randomized and not deterministic. The encryption methods take care of that. You only need the correct key to decrypt.
Passwords are not keys. If you meet in person, you can create a real random key. That means each bit drawn independently from $\{0,1\}$, not just a password of a certain length, which can be found in any dictionary. If you want to use a password or a passphrase, then you are advised to use a proper key derivation function for passwords, e.g. PBKDF2, bcrypt or scrypt (most recommendations today go towards scrypt).


The problem with tools is, that if they just write "AES" on top, that doesn't mean they use the same mode or the same key derivation function inside. If they do, then the decryption will work. Still, there are non-deterministic modes, where it is an explicit goal, that the same message encrypted twice can not be distinguished from random gibberish.

All you can do is to actually test the tools available to you, if they work in conjunction. And you can stick to the verified, popular implementations. Never use some amateur implementation - never implement your own crypto.