Main features in Photomatix for Linux v2

Merge to HDR
Maximum number of bracketed photos per set Unlimited
HDR "Look" with a Single Photo
Native RAW support
Realistic presets
Artistic presets
Real Estate presets
Black & White presets
Details Enhancer HDR style (Tone Mapping)
Contrast Optimizer HDR style (Tone Mapping)
Tone Balancer HDR style (Tone Mapping)
Tone Compressor HDR style (Tone Mapping)
Fusion/Natural HDR style (Exposure Fusion)
Fusion/Interior HDR style (Exposure Fusion)
Advanced HDR settings
Finishing (Sharpening & Contrast)
Crop Tool
Straightening Tool
Saving & loading custom presets
Thumbnails of built-in presets
Thumbnails of custom presets
Noise reduction
Automatic alignment of hand-held photos
Automatic ghost removal
Batch Bracketed Photos
Batch Single Photos Available in v3
Color managed workflow
Opens & saves in 32-bit HDR image formats