Library of footprints for Cadence Allegro / PCB Editor
Look on github : https://github.com  there are really a lot cadence allegro pcb foot prints on there.

Separate Search words to use one a time on github are :  Cadence  , ORCAD , allegro 

and then you will a lot of foot print.  

I suggest that you check the foot prints carefully a lot are chinese made .
From past experience you need to check engineering output from China to 
make sure that it is up to a standard that you your self would be happy 
to use.