With the massive increase in traffic on the internet these days you will find that the most popular way to try and make a second income without working a second 9-5 job is to start a business online. If you can find something that people want to buy and put your product - or someone elses for a commission - in front of them you can make money. Alternatively if you are interested in the stock market you can trade penny stocks to make cahs in your spare time.