I collect and sell Data Cores (DC's). They can also be collected for use but I prefer to collect and sell them and buy what I need. The income is pretty low these days but one hundred million ISK per month would be quite handy to a player starting out. As I've been asked how I go about this I thought it would be easier to chisel it here for the hordes of future players to view at their leisure.
I have three pilots that collect the DC's, lets call them A, B, and C.
They all visit the exact same research agents and purchase from the agent one or the other of two different DC's.
Pilot A travels around to all the agents in something small and fast, purchases the DC's and contracts them all at each location to pilot C.
Pilot B travels around to all the agents in something small and fast, purchases the DC's and contracts them all at each location to pilot C.
Pilot C travels around to all the agents in a fast hauler, purchases the DC's and collects the DC's contracted from pilot A and B, Pilot C then travels to the trade hub of choice and puts them up for sale at a price that should sell in the next day or so.
Once another month has elapsed do this again.
The hardest part is the initial setup as each pilot must gain enough standing with the research agents corporation to access the DC's, once that is done it becomes a high, medium, or, low income stream depending on your situation. As it currently stands however the research points that let you purchase the DC's accumulate while your account is active, so it's a very passive income.
Which could become handy if you lose everything.