Slow Shutter Cam
Slow Shutter Cam does exactly what you think it does: it helps you take pictures with a really cool slow shutter speed effect.
This app is especially useful if you want to take cool effects of moving lights or waterfalls, which is something you might not get with any other camera app.
Granted, this app is a bit old at this point, and it doesn’t come with nearly as many features as other options on the list. This means it won’t likely be your main camera app, but if you’re looking to take really different-looking pictures and still have great quality, the original Slow Shutter Cam is perfect for the job.