Links building services -as automated as possible?

Hi,

Say you have over 50 websites you would want to automate link building for...what would be your best choices as automated link building services (excluding senuke, venomseo etc)?

After some research found these (that seem the most effective):

- link pushing
- build my rank
- backblasts (cheap and great to drip feed your links)

Any other automated link building service that works (plus reasonable priced, as the above ones) you are aware of?

Nobody on this or are you just keeping them for yourselves?