Online surveys are another free online work that does not require cash. Companies are willing to pay for their opinion on their products or services and there seems to be a survey for almost anything. Most of these online jobs will be in the form of a set of questions that you must answer online.
As always, when you search online and especially when you are delivering your personal information, you should be aware of scams and frauds. Once you find potential companies for your online work, look for information about them online to see if other people have identified them as scams.