There are many things that can bring you money as you do your normal duties and here are some of them.
Hire out property
Do your research and find out which equipment, machines, cars or properties are in high demand, buy them and hire them out. Ask people like local mechanics which equipment do they need but cant afford, ask plumbers and others in cleaning or sound systems market.
Start a blog
Create a blog in your area of expertise and interest and build traffic then monitise it by adverts and google AdSense. However you have to be really good at your subject of choice.
Market goods for others online
Market goods for other people online and refer customers to the sellers’ shop and earn commission, the commissions will depend on the cost of the product you are selling. Go for unique products that few people are selling to cut competition.
Lend out money
You definitely know of someone who is broke or needs a quick loan, get some cash together and lend out at a fee to the people, you however need to be careful since not everyone will repay the loan back.
Hire other people to work for you and pay them part of the revenues, you can send money for people to farm for you back at home or pay someone to do dog walking for a neighbor on your behalf.
Import and sale unique products online
Importing products that are unique will give you stress free income as your job is to post the product online and then wait for customers to call sell it to them.