'Best' is a complicated and dangerous term. Some big apps Adobe Lightroom is very good, at lots of things. It's not just an excellent processing program designed specifically for photographers (unlike Photoshop), it's also a digital asset management tool, it will create slideshows, is great for printing (including softproofing), you can use it to design and order books (through Blurb), and more. It uses the Adobe Camera Raw raw converter also found in the Photoshop Creative Studio. Works very well a lot of the time. Nothing is perfect. You mentioned low-light shots. Lightroom's noise reduction is very good.
Not perhaps the best but pretty good. Lightroom was particularly designed for photographers who shoot and manage and process lots of photos. So many of its features are overkill if you don't shoot hundreds or thousands of photos a month.
Aperture has a feature set very similar to Lightroom's, but has a somewhat different user interface, and runs only on Macs. It's very powerful, and not expensive (through the App Store). I have never 'gotten' the Aperture UI, but some photographers love it. For what it's worth, I know way more professional photographers who use Macs and Lightroom than use Aperture.
DxO Optics Pro isn't so great at managing your photos but has some terrific processing features. Its raw converter sometimes produces a result that's quite different from Lightroom's. And the DxO camera + lens profiles are very good and can help with lens distortion and other problems. There are a couple other programs in this league that I'm going to skip over because I don't use 'em myself; others can mention 'em if they wish. Some small apps worth mentioning However you probably don't need Lightroom, or Aperture, or DxO Optics Pro! Here are a couple products I recommend you consider.
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Professional image editing software (RAW converter) for all Sony cameras. Use the 100% free Express version or buy the Capture One Pro Sony with even more functionalities incl. Tethered support for Sony A7 and A9. Jan 20, 2013 Best Photo editing for RAW photos 'A77'. Today I start to take photo with RAW format with my sony A77 camera and I edit my photo in sony Photo editor 'the one come with the camera'. But seriously, consider using Picasa for management (or iPhoto, if you got it free with a Mac) and getting either Snapseed or Photo Ninja for processing.
First, you can manage your photos with Picasa. And it's very good — not so much as a processing program, but as a file manager.
Picture Edit Software For Mac
I manage my originals in Lightroom, but I use Picasa to manage all my exported JPEGs, and I do tweak a photo in Picasa from time to time. Particularly useful if you share photos on Google+. Now, to raw processors. There are three that I'd mention in particular.
Image Editing Software
SNAPSEED is a gem of a program. It's small, it's one of the most intuitive programs ever made for dealing with photos (no graphs or curves), and it does a terrific job. Although I have Lightroom, Aperture, DxO Optics Pro (and if I get desperate, Photoshop) at my disposal, I process a lot of my photos in Snapseed.
Oh, and there are iPad and iPhone versions that work great, too. It's one major weakness is noise reduction. It basically doesn't have any. RAW PHOTO CONVERTER is like the polar opposite of Snapseed. It's small, too, and like Snapseed, it's strictly a processing program, not a file managing program. But unlike Snapseed, it's about as unintuitive as it can be. But I love it, at least I paid for it and use it from time to time.
Free Image Edit Software
It does slow, very careful raw conversions that very often recover detail that just isn't brought over by Adobe Camera Raw or the other converters. Finally, PHOTO NINJA. Does not yet support the A99 but will shortly. An awesome raw converter from the folks who invented NOISE NINJA so it's not surprising that PHOTO NINJA does really really good noise reduction. But it does all the rest of the image processing job as well. Very cool UI — different, and I can't say it's particularly 'intuitive' but once you get the hang of it, it can produce results that you can't easily get from Lightroom.