• x265: a fork of x265 Yuuki mod with aMod and some custom features and performance optimizations.
• VapourSynth-Classic: our VapourSynth fork without random incompatible API breaks; high performance & lower memory consumption. We also host VS-C and VS R54 VapourSynth docs.
• Public Tool Pack: we periodically release public versions of internal tool pack used in production encoding. It includes curated list of plugins & scripts that work well together.

• assrender: a plugin that renders ASS/SSA subtitle using libass.
• vs-boxblur: AVX2-vectorized box filter.
• vs-dfttest2: Accelerated DFTTest re-implemetation for VapourSynth, with CUDA, SIMD (CPU), and generic GCC vector (CPU) backends.
• vs-fgrain-cuda: Realistic Film Grain Rendering for VapourSynth, accelerated with CUDA. For CPU-only plugin, see EleonoreMizo's chickendream.
• vs-mlrt: efficient ML/AI Filter Runtimes for VapourSynth (with built-in support for waifu2x, DPIR, RealESRGANv2/v3, and Real-CUGAN).
• vs-nlm-ispc: non-local means denoise filter, drop-in replacement of the venerable KNLMeansCL for VapourSynth, but without the OpenCL dependency (CPU only).
• vs-nlm-cuda: non-local means denoise filter, drop-in replacement of the venerable KNLMeansCL for VapourSynth, but accelerated with CUDA (~10% faster with 1 stream, up to ~50% faster with multiple streams.)

We also host Windows binary releases for the following plugins:

• vs-ComparePlane: AVX optimized PSNR implementation.
• VapourSynth-WNNM: Weighted Nuclear Norm Minimization Denoiser for VapourSynth.
• VapourSynth-ILS: CUDA implementation of Real-time Image Smoothing via Iterative Least Squares for VapourSynth (Experimental).

For plugin developers, we have:

• vs-api3: a solution for dual api3/api4 plugins.

We also have a large number of forked VS plugins, and those are mostly for internal uses/experiments, though you're welcome to use them. Some of the notable ones are listed below:

• DCTFilter: DCTFilter with arbitrary DCT block size and other enhancements.
• FFT3DFilter: significant speedups.
• fmtconv: with experimental custom kernel support.

• vapoursynth-script: a collection of useful VS funcs (e.g. lexpr based Rgtools).

• ResampleHQ's resampling kernel virtualization, preserved from now defunct website.
• OKEGui: (Chinese only) fork of OKEGui (One-Key Encode GUI) batch BDRip encoding helper.
• WenQuanYi Bitmap Song TTF: A vector .ttf version of WenQuanYi Bitmap Song font. It has over 27,842 characters in 5 sizes.