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Most of these filters can easily be used in Video Enhancer which is a lot faster than VirtualDub on hyperthreading, dual core or multiple CPUs. (see comparison)
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Denoising filters
These filters help you remove different kinds of noise from the video. Spatial denoisers (smoothers) use current frame only, temporal ones use difference between frames.

2d cleaner optimized Donald Graft
Spatial denoiser blending low-level video noise by replacing each pixel with the average of its neighbors within a specified threshold.

http://neuron2.net/2dcleaner.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Area smoother Daniel Vollmer
Non-temporal noise-reduction for anime/cartoon material that does not affect background-areas. Replaces (more or less) uniformly colored areas by their average.

http://www.hlinke.de/tinc?key=U4rlLOrY&formname=VirtualDub_Filter

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Camcorder color denoise Sergey Stolyarevskiy
Removes colour noise of the video camera matrix.

http://acobw.narod.ru/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Chroma noise reduction Gilles Mouchard
Reduce the noise on chrominancy.

http://www.hlinke.de/tinc?key=U4rlLOrY&formname=VirtualDub_Filter

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
De-Ghosting flaXen
Undo ghosting" effects seen in analog video."

http://flaxen.edwardk.info/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Debayering Luca Ballan
Debayering (demosaic) filter for RAW videos in RGBG format.

http://www.inf.ethz.ch/personal/lballan/software.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Defogger From Noise Sergey Stolyarevskiy
Strong VHS video cleaning (denoising).

http://acobw.narod.ru/dfn.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
DotCrawl Comb Filter Scott Elliott
Remove crawling dots and false colours caused by NTSC composite video captures.

http://home.earthlink.net/~tacosalad/video/dotcrawl.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
FFT Noise Removal (YIQ) BirdzI Software
" Removes ""noise"" from the YIQ components of the video signal."

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Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Film Dirt Cleaner Infognition Co. Ltd.
Motion-compensated temporal denoiser for cleaning film dirt.

/dirtcleaner/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Frequency Suppressor of the Noise Sergey Stolyarevskiy
Fourier-based denoiser working in frequency domain. For VHS and DV.

http://acobw.narod.ru/fsn.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Gaussian Blur Emiliano Ferrari
Advanced Gaussian Blur Filter.

http://emiliano.deepabyss.org/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
General convolution 3D Gunnar Thalin
A general 5x5 convolution filter with an extra dimension - time. It applies one matrix to the current frame, another matrix to the previous and yet another one to the frame prior to that.

http://www.guthspot.se/video/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Ghost Remover Emiliano Ferrari
Remove ghost image.

http://emiliano.deepabyss.org/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
High Quality Smoother Klaus Post
Smooth/blur while preserving structure. Based on smart smart smoother by Donald Graft

http://neuron2.net/hiq/smoothhiq.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
MSU Cartoon Restore MSU Video Group
Improves compressed animated cartoons quality by removing ringing artifacts.

http://compression.ru/video/cartoon_restore/index_en.htm

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
MSU Deblocking MSU Video Group
Recovering quality of video ripped from DVD, VideoCD or after decompression.

http://compression.ru/video/deblocking/index_en.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
MSU Denoiser MSU Video Group
Designed for noisy video stream processing, video quality improvement, or video preprocessing. The filter implementation is able to use GPU processing power to increase the processing speed.

http://compression.ru/video/denoising/index_en.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
MSU Smart Deblocking MSU Video Group
Recovering quality of video ripped from DVD, VideoCD or after decompression. Automatically determines the blockiness' strength on the frame and in the concrete part of it.

http://compression.ru/video/deblocking/smartdeblocking_en.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Median filter Sergey Stolyarevskiy
Classic median 3x3 filter for removing VHS noise.

http://acobw.narod.ru/mediana.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Neat Video ABSoft
Reduce noise in video. A very good denoiser.

http://www.neatvideo.com

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Noise Reduction/Shifting/Cropping (NRS) Filter Antonio Foranna
Reduce changes across frames & blur preserving structure & crop and center images & adjust gamma.

http://neuron2.net/nrs/nrs.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Nonlinear Dynamic Filtering Sergey Stolyarevskiy
Nonlinear Dynamic Filtering

http://acobw.narod.ru/ndf.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Nonlinear Smoothing Loss-Free Sergey Stolyarevskiy
In-frame smoothing preserving sharp details.

http://acobw.narod.ru/nslf.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Nonlinear Smoothing Loss-Free 3D matrix 3*3 Sergey Stolyarevskiy
Nonlinear Smoothing Loss-Free 3D (3x3)

http://acobw.narod.ru/nslf_3d.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Processing the linear hindrances Sergey Stolyarevskiy
Removes specific videotape artefacts like random white horizontal lines. Designed for interlaced content.

http://acobw.narod.ru/plh.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Processing the pulsed hindrances Sergey Stolyarevskiy
Removes dust" noise."

http://acobw.narod.ru/pph.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Random noise remover Mikhail Rozov
Reduces random noise across frames without bluring.

http://mediatory.ru/article21_article_24_1.phtml

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Smart Line smoother MIDIMaker
Smooths line while preserving structure.

http://midimaker.narod.ru/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Smart Skating Rink Sergey Stolyarevskiy
Spatial denoising filter.

http://acobw.narod.ru/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Smoother Emiliano Ferrari
Blur effects.

http://emiliano.deepabyss.org/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
SpotRemover Konstantin Khlopenkov
Removes dust and spots from damaged films. Includes optional time smoothing to suppress film grain.

http://spotremoverfilter.com/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Super temporary cleaner Sergey Stolyarevskiy
Temporal filter for clearing of noise. Gives a delay of video so it is necessary to correct a delay of audio on 0.08 sec.

http://acobw.narod.ru/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Vague Denoiser Emiliano Ferrari
Port of VagueDenoiser plugin for Avisynth.

http://emiliano.deepabyss.org/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Video DeNoise Alexander Tchirkov
Suppression of noise as small bright lines, red or blue color, less often green.

http://www.risingresearch.com/en/denoise/index.shtml

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Yet another temporal smoother Eric A. Welsh
YATS averages pixels in the current frame with pixels in the previous frame. YATS differs from other filters in the extra processing it does to be extra paranoid about moving pixels.

http://www.doom9.org/index.html?/software2.htm

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
box blur Donald Graft
External filter of VirtualDub's internal Box Blur filter with opacity slider.

http://rationalqm.us/boxblur/boxblur.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
denoise tHE fISH
Denoise filter like Donald Graft's deflicker filter with a window size of 1.

http://neuron2.net/hosted.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
dynamic noise reduction (MMX) Steven Henk Don
Reduces changes across frames by eliminating dynamic noise without blurring. This one is a lot faster and blends noise over time.

http://www.shdon.com/vid/vid_dnr

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
frame merger Valentim Batista
Smooth temporally the picture by blending each frame with the previous one in order to reduce noise and artefacts.

http://www.geocities.com/gc_timsara/vdub/fm/framemerger0.1.htm

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
fxTemp flaXen
Advanced Temporal Stabilizer.

http://flaxen.edwardk.info/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
pops Valentim Batista
Remove or smooth pops, near white or near black spots and streaks that appear in some bad film copies translations to video, by temporally processing the picture.

http://www.geocities.com/gc_timsara/vdub/po/pops0.1.htm

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
proximity locker Chir
Complement to existing pixel-locking filters, like Flaxen's fixVHS or Jim Casaburi's Temporal Cleaner.

http://www.geocities.com/chir_geo/dub/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
shadow smoother Valentim Batista
Spatial and temporal smoothing in the shadow areas of video.

http://www.geocities.com/gc_timsara/vdub/ss/shadowsmoother07.htm

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
smart smoother Donald Graft
Smooth/blur while preserving structure.

http://neuron2.net/smooth.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
smart smoother HiQuality Klaus Post
Smoothing on video material to eliminate noise and MPEG artefacts.

http://neuron2.net/hiq/smoothhiq.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
smart smoother IQ Tim Park
This filter performs structure-preserving smoothing (blurring) on the I/Q (chrominance or colour) information of the image, leaving Y (luminance) intact. Attempt to reduce the appearance of rainbows" (cross-colour artifacts) near lines in cel animation."

http://www.doki.ca/filters/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
spatial smoother Ioura Batugowski
Blur filter that operates only on pixels whose colour is reasonably close to each other.

http://users.win.be/ws200482/virtualdub.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
static noise reduction Steven Henk Don
Reduce random noise in the image while maintaining contrast.

http://www.shdon.com/vid/vid_snr

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
temporal cleaner Jim Casaburi
Modified version of VirtualDub's internal temporal smoother filter that only averages pixels between frames that are within certain thresholds.

http://home.earthlink.net/~casaburi/download/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
verticalblur M1Research
Vertical Blur Video.

http://research.m1stereo.tv/wiki/index.php/Virtualdub-filters

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)