What is the meaning of (something which sounds like) "nö", "ne" or "no" at the end of a sentence?

Question

I commonly hear people saying something like:

• Aber du wirst mir noch den Rest heute bezahlen, ne?

• Heute fühle ich mich nicht wohl, ne!

oder

• Versuch es anders, ne!

I've tried to capture in the previous sentences the most diverse significantly different situations in which I've heard it.

I assume that it means oder? but:

1. Which is the right spelling? If it's not standard, which is the pronuntiation?

2. Which are all the possible meanings? (I assume they are not a lot)

Answer 1

The correct spelling is ne and it's a common but informal interjection in many parts of Germany. It replaces nicht wahr? and oder? in some dialects. Note, that it does not mean Nein in this context¹.

The pronunciation may vary between dialects from a clear German e-sound to a German ä-sound. But it's definitely not pronounce with an ö-sound. Nö would again be Nein¹:

Siehst du doch auch so, ne?

Nö, seh' ich nicht so.

The German a-sound may be used as well but I guess it's rather used when you're challenging someone.

Naaaa? Schaffst du es oder brauchste Hilfe?

Typically, the ne-interjection is used likewise to isn't it? in English. Thus, your second and third example is somewhat weird as being exclamations which are usually not followed by ne.

Apart, in my dialect you may hear wa instead of ne.

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¹ Ne (or nö) can also mean Nein but than it's preceding the sentence and not following it.