Research in most of the nonedible oil crops previously mentioned has been insufficient. To determine the viability of their use as a source of biodiesel and to optimize the transesterification as well as engine performance, more research is needed. But, there are also other nonedible and low-cost edible oily crops and trees that could be exploited for biodiesel production. Amongst them, allanblackia, bitter almond, chaul — moogra, papaya, sal, tung, and ucuuba produce oils that hold immense potential to be used as a raw material for producing biodiesel. Most of them grow in underdeveloped and developing countries, where governments may consider providing support to the activities related to collection of seeds, production of oil, production of biodiesel, and its utilization for cleaner environment. Hence, to facilitate its integration, a legal framework should be legislated to enforce regulations on biodiesel. Biodiesel should be seriously considered as a potential source of energy, particularly in underdeveloped and developing countries with very tight foreign exchange positions and insufficient availability of traditional fuels.