It has free and paid editions.

http://www.videoartifact.com/va/

Program helps you to prepare footages from consumer or professional video cameras, digicams and V-DSLR.

It can remove MJPEG, MPEG, H.264, H.265 compression artifacts and digital noise, improves sharpness and color resolution up to 16 bit 4:4:4.

Restoration features:

• Script-based to work with unique cases. You can use many filters in any combination.
• 50+ specialized restoration filters work in Y, U, V separately in 8/16 bit.
• Possibility to use dozens of different type denoisers for different noise type.
• Accurate denoising that keeps micro details with no "plastic" effect.
• Removing of sharping halos.
• Linear color high quality spline-based resize to resize up to 4K. Resize halos can be removed.
• Precise halo-free radius-dependent sharping.
• Film grain emulation and 3D LUT grading.
• 4:2:0 8 bit to 4:2:2/4:4:4 16 bit chroma reconstruction.

It can be used in a post-production workflow if you use V-DSLR or consumer cameras.
Currently 50+ camera models supported and hundreds of compatible models.

Special features:

• Batch processing without GPU. Very fast: 5 fps for typical V-DSLR AVCHD source and 2 fps for 4K.
• Automatic joining of MTS, MOV and MP4 spans and renaming to yyyymmdd_hhmmss.mov format.
• Non-standard 16-255 to TV 16-235 levels conversion.
• ITU-R BT.601 ↔ BT.709 floating point conversion.
• NLE and DaVinci Resolve compatible workflow.
• Mastering to webm VP9/Opus or mp4 H.264/AAC 1080p/720p/360p/240p.

Examples with various restoration methods are available at http://www.videoartifact.com/examples/

Some samples:

P.S. I sent Apefos a message but am still waiting to hear from him, just thought I'd try all possible avenues to figure this out.

Banding:

example: i´m shooting a sunset with the gh2

1. set the proyect settings to 16bit
2. double the layer
3. on the upper layer isolate the banding area, can be rotoscoped, or keyed out, in this example is easy to key out the sky as it is only made of one color
4. on the bottom layer use a blur effect

--pros: it truly gets rids of the banding

--cons: is useful only for soft areas with not much detail, but then again, banding almost always appears only on these areas

Dynamic range:

example: im shooting an actor on a bedroom, and a window is in frame, therefore i´m in backlight against the sun, so either i blow up the window or i underexpose for the actor, unless i increase the light of the bedroom, i have to choose, here is a trick:

1. Camera must be stationary (over a tripod)
2. Shoot the scene, exposing for the talent
3. Without changing the frame, shoot again with no actor, exposing for the window
4. Mix both shoots on the editor, rotoscoping the window against the actor.

--pros: increases the dynamic range of a camera, gives more information for color grading

--cons: the camera shouldnt move, and rotoscoping is tedious