1)   Elecard XMuxer Pro 2.5
Elecard XMuxer Pro is video editing software designed for professionals and enthusiasts to demultiplex, multiplex, and remultiplex MPEG-2 Transport and Program Streams as well as MP4 files, trim HD DVD, iPod, PSP and AVI files.

 2)   R9 MPEG2 SDK Multiplexer Library 0.85
MPEG2 SDK Multiplexer Library for developers. Supports MPEG1,VCD,MPEG2,SVCD,DVD streams. 100% ISO standard compliant. Available as static library or with full source code. Very fast, easy to use. Competitive prices. Download a free evaluation copy.