There are several freelancing web sites that offer variety of jobs. Most of the time people have a misconception that such sites offer only software related jobs. However these sites offer jobs ranging from accounting, writing, research to legal and financial fields.
Clients post jobs on these sites. Freelancers need to register (one time process which is mostly free) and apply to jobs. Depending on the client, sometimes there may be an interview. Most of the times these jobs are flexible with respect to work timing /hours of work per day. So you can opt to only apply for jobs which are less demanding and suit your requirements. Of course there is a lot of competition and you need to build up a reputation in order to get the jobs you desire. There is also a possibility of getting duped by fraudulent client so be careful and read client reviews before taking something up.
Food/Travel blog/Hobby blog
Do you love experimenting in the kitchen or are passionate about travelling? Why restrict your overtures to yourself when you can easily use your hobby to earn some extra income? You can easily do so by starting a blog in the field of your choice.
Of course you need to have patience till your site gets popular. Also the revenue you earn may not be that much at least initially till you gain popularity but its a great way of combining hobby with income.
Part time job sites
There are several sites which connect you with employers who are looking for part time jobs. Most of the times these are small companies who do not want to invest in office space and other infrastructure. These are different from the freelanceing sites that I mentioned above in that the jobs posted here are more like regular jobs but offer flexibility in terms of work hours and work from home options.