This page is a directory to all kinds of software with HDR capabilities. They are grouped by common tasks, and sorted in alphabetical order. Most of them have a more elaborate introduction in the HDRI Handbook, and the most interesting ones are featured in tutorials. The rating on this page, however, is not just mine. It's based on popularity, and according to the community approach you're invited to put in your vote!

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Viewer and Thumbnailer

The golden oldie! Lightweight viewer for Radiance(.hdr), floating point TIFF(.tif) and (.pfm) files. Launches immediately, and lets you tap through exposures with +/- keys.
PC | Free | stalled
HDR Thumbnail Browser with display mapping capabilites. The only app supporting every single HDR file format. HDR Combination works with absolute luminance calibration, hence suitable for analytical applications.
Mac | Free | active
Excellent everyday thumbnail browser. Can deal with Radiance and OpenEXR files, althoug not perform any display mapping. But it's packed with tons of general-purpose features. Batch-Renaming, Lossless JPEG transformations and the like.
Mac, PC, Linux | Free | active

HDR Utilities

Combines exposures to an HDRI with semi-manual ghostbusting (painting garbage masks), and a unique pin-warping aligment. Sports 6 different tonemappers and slick little curve/color controls to tweak the output right away. Super-polished interface and integrated help.
PC | $39 | active
HDR Combination with a unique histogram slicing mode to manually fight those pesky ghosts. Also allows to manually fine tune exposure alignment. The Advanced version features a local tone-mapper that does a phantastic job in working out contrasty details.
Mac, PC | Basic: Free, Advanced: $52 | active
The godfather of all HDR utilities. HDR Combination is very dated, and it does tone mapping only via Plugins. But it has a good amount of editing capabilites, that still make it the swiss army knife in HDR. Development on HDRShop has stalled, though.
PC | v1: Free, v2: $400 | stalled
HDR Combination and Tone-Mapping, very user-friendly hence recommended for beginners. Sports ghost removal and batch processing, which makes it photographer's favorite. Runs fine in trial mode, but you get a whole lot of tone mapping goodness in the full version.
Mac, PC | free Trial with watermarking, $99 | active
The new kid on the block, hosted right here. Highly configurable HDR Combination and fastest tone-mapper around. It runs HDRShop plugins, and performs basic conversion tasks. Not quite as many editing features as HDRShop yet, but eventually getting there...
PC | Free | active
pfsTools is the equivalent to PanoTools in the HDR world: an excellent suite of powerful commandline utilities. And QTpfsGui is the first derivative with a user interface. Plenty of local TMOs for free, although not much interactive feedback. Aligning exposures can be done via Hugin's image stack.
Mac, PC, Linux | Free, Open Source | active

Paint Packages

Full package, including Thumbnail Browser and Album Generator and everything. Includes plenty of tone-mappers and can apply them all on the fly as display mapping. Really elaborate featureset, although not everything works reliably in HDR mode.
PC | $55 | active
Screamingly fast editor, because it uses the the CoreImage engine of OSX to do all the heavylifting. Meant for the quick edit on the go, but turns out to have more HDR editing capabilites than anything else. Still fighting for stability, and deserves some support by early adopters.
Mac | honor system | active, alpha-stage
Formerly known as Film Gimp, and recently reborn as (and in) Glasgow. This one had a tough life already, ever since it split from the GIMP family to become a movie star. Features a very comprehensive color management system, and has a complete set of HDR painting tools.
Mac | free | semi-active, beta-stage
Full 32-bit editing and painting capabilities since 2002, in the latest version 7 even with curve adjustments. Based on a unique workflow, where filters and adjustments are painted on. Includes direct HDR capturing from a tethered camera.
PC, Linux | regular $699, now $399 | semi-active
The king. Has gained quite some weight over the time. The "Extended" version has HDR Layers and Brushes, on top of a great standard HDR Generator. Tonemapping is basic, but very predictable, and extends via Plugins from FDRTools, Photomatix and Artizen. Huge in stability and handling big files.
Mac, PC | Basic $699, Extended $999 | active
Could be Photoshop's twin, except that it is tiny and ultraportable. Runs on almost every OS, and has all the layers, brushes and adjustments laid out just like Photoshop. Still in beta stage with some stability issues, but something to keep an eye on.
Mac, PC, Linux, BeOS, FreeBSD, Zedora... | $39 | active, beta-stage

Panorama Stitching

Everything is automatic here, not even the exposure brackets have to be sorted out. You just give it a folder and it spits out any pano it can stitch. Works often great, but sometimes makes funny choices. Manual control is somewhat limited. Latest version 1.4 supports Fisheye, has a super slick interface, and plays well with 64-bit Windows.
Mac, PC | $119 | semi-active
Community-driven stitcher, that carries on the tradition of PanoTools in the Open Source domain. Can stitch HDR segments, supports fisheye lenses and a huge amount of fun panoramic projections. Soon to step up to a modern one-step workflow from LDR bracketed segments to HDR panorama.
Mac, PC, Linux | Free, Open Source | active and buzzing
Leading PanoTools-Frontend, with reliable automatic control point creation and excellent manual tweakability. Fisheye support is a given, and it already sports HDR pano generation directly from the LDR exposure brackets. Even includes a Tonemapping module.
Mac, PC | $148 | active
The top edition Stitcher Unlimited 5.6 can stitch HDR segments. Does not sport a modern one-step workflow, HDRs have to be generated elsewhere. RealViz Stitcher is known for the flashiest interface, panoramic patching tools, and extra import/export formats. Must register to download demo version.
Mac, PC | $580 | active

I'm cheap. Show me only free software!