These speak for themselves, for the most part. But it might be worth noting that none we’ve noticed have electric assist, either by hybrid electric or solar electric, which are both, we believe, in limited use around the world.
From FrogMob, the mob-sourced section of the FrogDesign Blog ((From the reknowned design firm FrogDesign – where they design everything except frogs)), Work Bikes:
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From the Cool Tools section of Kevin Kelly’s site, kk.org:
XtraCycle - Free Radical - after-market modification/accessory
This is only one of nine variations of the Free Radical Conversion kit. See that – and bicycles with cargo carrying included, at XtraCycle.
Cool Tools also has great suggestions about bicycle repair tools, and other modifications. Check their Autonomous Motion section, their Bikes/Trikes subsection of their Street Use archives for more work bike info, including Velowalla, an archive of bike/trike use for business in India.