I'm looking for a simple but comprehensive list of alternatives to
war. Is there any project that maintains  a catalogue or database of
all the alternatives that have ever been suggested? Ideally with brief
comments about the pros / cons / applicability / feasibility of each.

I'm surprised that I get ZERO results when I type the following search
phrases into Google:  "catalogue of alternatives to war"; "database of
alternatives to war"; "table of alternatives to war"; "summary of
alternatives to war"; "overview of alternatives to war".

The search phrase "list of alternatives to war" yields only 6 results.
 None of them looking like a serious attempt to maintain a definitive
list.

Searching on "alternatives to war", however, yields so much stuff that
I don't know where to begin.

The 19th Century 'alternative' were Trade Treaties that defined
spheres of interest with cartels, etc.

The 'alternative' to war in the 1930's was the Appeasement Policy
adopted by Britain which tried to buy off Nazi territorial ambitions
with Treaty proposals and loans.

Since WW2, the 'alternative' to war has been the availability of
overwhelming force and the Nuclear Deterrent, as practised by the USA
since WW2, allied to 'Dollar Diplomacy'.

I will be watching this question to see if anyone finds such a thing .
. . it's a great question, thanks

This site: http://www.unitedforpeace.org/
has a search function on the 'groups' button for finding peace and
justice groups; it seems very well catalogued, but I know that isn't
exactly what you're looking for.

It seems our utter lack of creativity has resulted in using the 'last
resort' sooner than necessary.

Great utterance Probono.

You were so clever to "answer" this unclarified question"

It would be like asking: what is the alternative to sergery.

One would first need to know (clarify) what the ailment is.

If the sergery is to remove an ingested needle that is heading for a
vital organ, the alternative may be death. If the sergery is to reduce
ones obesity, the alternitive may be to stop "PIGGING-OUT".

I would ask that same question if I were a "peacnick"(one who wants no
war at any cont).
Being a "Tough-lover", I would ask Martha James: What was God's
altrenative to war against the devil when he was sitting at the right
hand of God in Heaven?

So you see Martha, sometimes there are no alternatives, especially if
we are fighting for PEACE...

toughlover, here you are again .... !

I always find it fascinating that, right down through human history,
that so much blood has been spilled in the name of the Prince of
Peace. What part of 'blessed are the peacemakers' do you not
understand?