They are making some nice money each year, but the trend is quite clear: given same traffic I am making about 50% less each year. Ad revenue is way down (more adblock users, less money per click, CTR is down), but paid premium plans are balancing it a bit.
These projects are still my biggest passive income stream, but they are going to die in few years. Other than that I am owning agriculture land (that I am renting), rental property and portfolio of p2p loans.
Those traditional assets are much more expensive to acquire, but then the yield is much predictable and stable. Still, the tech projects are my best source of income considering the amount of money/time required to create it.