These are some great ideas! We are looking into a Drupal plugin as well. A WordPress plugin is very important as mentioned above.
If anyone has any more links we will definitely check into it.
Also, does anyone know of any open source market platforms for buying and selling?
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My FPVtv project is new (website is only 1,5 months old, started from scratch in this time ) but it's growing really fast coz is about FPV and flying drones, more new functionality like cryptocurrencies will be greate, it can give really big opportunities ( greate support will be also needed ). I am ready for full support DGB on my website.
Drupal is also good idea, joomla is dying slowly , wordpress is growing every day coz it has biggest community and milions plugins, and we should hit that fast