I'm not sure how many people are aware, but @Slavik has offered up the awesome Xentrader to any qualified developer to take it over. There are quite a number of people in the thread that have offered to contribute to the costs of development, so there appears to be a decent opportunity for someone:
https://xenforo.com/community/threads/xentrader.27673/page-13#post-838749
https://xenforo.com/community/threads/xentrader.27673/page-13#post-838749
