Because interest rates in banks etc are so low at the moment, some people have established entities to provide a better return without significantly increased risk. You won’t get double digit rates, but they do beat the banks by a long way.
For instance, some frum guys I know set up Grey Rock Capital (they have a website) which gets funds from people with money sitting around and uses those funds to provide collateralised loans. For instance, they make bridging loans on real estate at up to 70% loan to value, so they get security of 100 for a loan of 70.