Before I even get into this let me remind you that farming is just digging a hole and putting in a seed. Some farmers still dig the hole with a stick. Some do it with a big tractor. The tractor is a lot faster but, and here’s the point, you don’t NEED the tractor. Is it better? Yeah. Faster? Yeah. Do a better job? Yeah. But you can still farm if you can’t afford a tractor.
That said, the stick way of investing (to use this analogy to death) is to get the annual reports and dig through them. Slow, painfully slow, but doable. If you look around, you'll find some free internet tools that have info on thousands of stocks. They have terrible search tools but once you know the company you want to research they have about 70% of what you need there for free if you don’t mind digging around to get the data out.
Beyond that you will need to Google for news and management and use an Excel spreadsheet to figure value. Then I would add a few key indicators: MACD, Stochastic and Moving Average. Read up on these and program them for the kind of investing you are doing.
That’s about the cheapest bunch of tools I know of if you want to do this without an integrated toolset.