Contrast/Opposition:
* But
* Yet
* Nevertheless
* Nonetheless
* Still
* On the other hand
* Conversely
* In contrast
Introducing a surprising or unexpected point:
* Though
* Although
* Despite
* In spite of
* Even so
Other words with similar connotations:
* Anyway
* Anyhow
* Regardless
The best choice depends on the specific context and the tone you want to convey.