In spite of/ Despite  (a pesar de) Link two contrasting ideas. Followed by a noun phrase.
Although/ (Even) though (aunque) Link two contrasting ideas. Followed by a sentence.
However/ Nevertheless (Sin embargo) Still / Yet (Aún) Even so (Aún así) On the contrary (Por el contrario) In contrast (En contraste) Introduce a new idea which marks a contrast with previously stated ideas. Introduced by a comma.
On the one hand ... On the other hand. (Por un lado… por otro lado/ por el otro) Links two contrasting ideas / paragraphs.
In contrast to (En contraste con/a) / Contrary to (Contrario a) Link two contrasting ideas. Followed by a noun phrase.
Whereas (Mientras) Link two contrasting ideas. Not separated by commas. 

Because / As / Since / Seeing that Introduce a sentence. Subordinate sentences introduced by because always appear in final position. .   
Because of / On account of / Owing to / Due to Introduce a noun phrase. 

In order to / So as to Introduce an infinitive of purpose.      In order that / So that Introduce a sentence. 

Consequently / As a consequence / As a result / Therefore        As a consequence of / As a result of Followed by a noun phrase.     
So Introduces a sentence. No commas.   

Moreover / Furthermore / In addition / Besides / What's more Used after a strong pause and separated from the sentences. They are introduced by a comma.     
As well as / In addition to / Besides Used to add  one more piece of information. Followed by a noun phrase.   

 For example / For instance Introduces an example referring to previously stated ideas.     
Such as Introduces an example referring to the last idea.  

but / yet: followed by a noun phrase or a sentence.   
in spite of / despite: It is placed at the beginning or in the middle of the sentence. although / though/ even though / in spite of the fact that: followed by a complete sentence. They can be placed at the beginning or in the middle of the sentence. If it is placed at the beginning we need to use a comma after the clause.   
however, nevertheless, even so, on the one hand, on the other hand, on the contrary
 while, whereas  

because, as since, seeing that, because of, on account of, owing to, due to,  in order to, so as to, to

for example, for instante, such as, more over, furthermore, besides, in addition to: ‘ apart from, except for: 

- First of all / Firstly / To begin with / First ….  - Second / Secondly / Then …  - Third / Thirdly / After that...  - The next stage …  - Finally / in short / to sum up / in conclusion / lastly / last but not least…    

 First parragraph
At first sight: A primera vista
First: En primer lugar
First of all: Antes que nada
In the first place: En primer lugar
To start with: Para empezar
 
 Second parragraph
In the second place: En segundo lugar
Second: Segundo
Secondly: En segundo lugar
Third: Tercero
Thirdly: En tercer lugar
 
 Conclusion
Finally: Por último
In conclusion: Para concluir
Lastly: Por último
And eventually: Y finalmente

Adding information
apart from: Aparte de
in addition: Además
in addition to: Además de
What’s more: Además; lo que es más
moreover: Además
on top of that: Además
besides: Además
On the one hand: Por una parte
On the other hand: Por otra parte
and eventually: Y finalmente
 
Contrast
all the same: a pesar de todo
however: sin embargo
instead of: en vez de
in spite of / despite: a pesar de
nevertheless: no obstante
on the contrary: por el contrario
whereas / while: mientras
though / although: aunque
 
Reason
because of + noun: a causa de
due to + noun: debido a
due to the fact that + sentence: debido a que
for this / that reason:  por esta / esa razón
owing to + noun: debido a
owing to the fact that + sentence: debido a que
 
Result
as a result: como resultado
because of: a causa de
consequently: en consecuencia
so: por lo tanto
that's why: por eso, por esa razón...
therefore: por lo tanto
 
 Expressing facts
actually: en realidad
as a matter of fact: de hecho
in fact: de hecho
really: en realidad

Expressing a personal opinion
as far as I am concerned:   por lo que a mí respecta
from my point of view:   desde mi punto de vista
I agree:   estoy de acuerdo
I disagree:     no estoy de acuerdo
in my opinion:   en mi opinión
in my view:  según lo veo
I think that :   creo que
it is true that:   es verdad que
personally:     personalmente
to be honest, :  para ser honesto
to tell the truth, :   a decir verdad

Explain
that is (to say): es decir
in other words: en otras palabras
in short: en resumen
above all: sobre todo
all in all: en general
at least: al menos
basically: básicamente, fundamentalmente
especially: especialmente, sobre todo
essentially: esencialmente
in general: en general
in particular: en particular
more or less: más o menos
on the whole: en general
to a certain extent: hasta cierto punto
 
 Exemplifying
and so on: etcétera
for example: por ejemplo
for instance: por ejemplo
such: as tal(es)como

Summarizing
all in all: en suma
in brief: en resumen
in conclusion: Para concluir i
n short: en resumen
on the whole: en general
to sum up: Para resumir

Sequencing
after that: después de eso 
all of a sudden: de repente
Finally: Finalmente 
First of all: En primer lugar 
in the end: al final 
in the meantime: mientras tanto 
meanwhile: mientras tanto 
next: luego 
suddenly: de repente 
then: entonces, después 
while: mientras