darktable
Open source photography workflow application and raw developer
What is darktable?
darktable is a virtual lighttable and darkroom for photographers: it manages your digital negatives in a database and lets you view them through a zoomable lighttable. it also enables you to develop raw images and enhance them.
This project tries to fill the gap between the many excellent existing free raw converters and image management tools (such as
UFRaw or 
F-Spot). The user interface is built around efficient caching of image metadata and mipmaps, all stored in a database. The user will always be able to interact, even if the full resolution image is not yet loaded.
All editing is fully non-destructive and only operates on cached image buffers for display. The full image is only converted during export. the frontend is written in gtk+/cairo, the database uses sqlite3, raw image loading is done using libraw, hdr, exr and low dynamic range are supported through imagemagick (magickcore). the core operates completely on floating point values, so darktable can not only be used for photography but also for scientifically acquired images or output of renderers (high dynamic range).
This project tries to fill the gap between the many excellent existing free raw converters and image management tools (such as
UFRaw or 
F-Spot). The user interface is built around efficient caching of image metadata and mipmaps, all stored in a database. The user will always be able to interact, even if the full resolution image is not yet loaded.All editing is fully non-destructive and only operates on cached image buffers for display. The full image is only converted during export. the frontend is written in gtk+/cairo, the database uses sqlite3, raw image loading is done using libraw, hdr, exr and low dynamic range are supported through imagemagick (magickcore). the core operates completely on floating point values, so darktable can not only be used for photography but also for scientifically acquired images or output of renderers (high dynamic range).
Darktable's 16-bit-per-color, non-destructive photo editing allowed me to finally get rid of Adobe Photoshop so that I could switch to Linux. I still use GIMP for filters and drawing/touch-up, but do all my initial editing and color correction of RAW files in Darktable. Photoshop is more convenient because it does filters and touch-up in the same application, but Darktable works on Linux and is good enough (with GIMP), so bye-bye Adobe (and Windows)!
DarkTable is similar to Adobe Lightroom and open source. If you come from LightRoom DarkTable is very familiar..
Windows 7 does not work on
More powerfull than Lightroom.
FOSS.
I would use it as a replacement for Irfan View in some situations. When it comes to color correction, it is definitely more user friendly than nomacs. Still nomacs is handy as to batch conversion.
I use it for all my raw photos to edit and to transfer to other formats.
Windows support now, if you're into that.