To add more information:
also, further, furthemore, apart from this, what is more, in addition, as well as, besides, moreover, in the same way, not only...but also, additionally
To give examples:
for example, for instance, in this case, as follows:, particularly, in particular, specifically, especially, mainly, more precisely, namely, in brief, in short
To state the obvious:
obviously, clearly, naturally, of course, surely, after all
To generalize:
in general, on the whole, as a rule, for the most part, generally speaking, in most cases, usually
To show cause & effect:
because, because of this, thus, accordingly, hence, therefore, in order to, so that, in that case, hence, under those circumstances, as a result, as a consequence, in effect
To contrast:
on the other hand, on the contrary, alternatively, in contrast to, rather, otherwise
To show similarities/to compare:
similarly, in the same way, likewise, just as
To paraphrase:
in other words, that is to say, that is
To show concession:
even though, however, nevertheless, still, yet, while, although, whereas, despite, in spite of
Transition words:
now, with regard to, as, as for, so, it follows that, meanwhile
To conclude:
finally, to conclude, lastly, in conclusion