I am just trying to write few scripts to find prospects (majorly company) who will be interested in buying our SAAS tools. For this I use variety of source like

1)Crunchbase data export (found it was little old) and crunch base Rest API has limit per day (so not very scalable).

2)Linkedin directory search but its hard to scrape linkedin they have very smart algo to stop it, I had to change my ip using tor after every few request and then also has to put random timing in between request and then also they blocked account which I was using for that search.

3)Few websites like rivalseek etc for search and then scraping them , result have lot of duplication.

All the above scripts are very scattered and doesn't look like a nicely build system. It would be great to know what others have done for this, like any scripts which they combined and major free sources they get information etc? Anything which you guys will add value to discussion?