Windows: As good as camera phones are these days, they can still produce some blurry images, especially of moving subjects or in low light. While you could try to sharpen them up in a feature-rich app like Photoshop and futz around with a bunch of sliders and settings to get decent results, SmartDeblur does a great job with a lot less fuss.
Screenshot by Carlos Macias.
This is a simple app for a single problem, but it delivers on its promise. Just load up a photo, adjust the kernel size and smoothing parameters as needed, then hit "Analyze Blur" to fix the photo. SmartDeblur is no miracle worker — the photos won't become crystal clear —- but the app absolutely holds its own against real image editors when it comes to minimising the issues.
If you need to fix a lot of photos, a batch process in Photoshop will be faster, but SmartDeblur is still handy when you just want to sharpen a photo or two. It's also a great app to send to any of your friends who don't own or aren't comfortable using full-featured image editors.