Total Gross Revenues: $20,000 or so.
Mostly from a single high-traffic niche site which I promote almost exclusively through social media. My site offers a free version of what a few other websites in the same niche offer as a SaaS service.
From that same site, most of the revenue (~80%) is from ads (ad revenue increased when switching to responsive units). Next, Amazon associate makes up about 15% of the revenue. And about 5% from donations.
The downside is that ad rates are DROPPING pretty quickly, ad-block usage rates are increasing rapidly, some browsers block ads by default now, etc. So I'm trying to get off of ad dependency.
I'm thinking in the future a Patreon funded project or project with additional SaaS component will probably fare better if you traffic is at least medium size (~50k/mo+), and comprised of repeat visitors.
I also have eBooks, which despite the rapid increase in popularity of Amazon authors, seem to be doing well. My most popular eBook is bringing in ~40$ / mo on the 35% plan (I can't use the 70% plan because someone stole it and uploaded it elsewhere). The rest of my eBooks are bringing in ~$20 total. If you have expertise, and strong communication skills - eBooks may be a good route to go down. Leanpub offers higher % rate, and I've seen some technical authors make a killing there - might be a better option.
As far as stocks go, I'm all invested in Vanguard which seems to like tech stocks - so not so great this year. The high-dividend yield funds are probably the way to go in 2016 since growth growth isn't so hot right now.
I would stay away from IoS & Android because app discovery is messed up, and you need a marketing budget in most scenarios to make it big.