In this study, oils of the seeds of Azadirachta indica(Neem), Mangnifera indica(Mango), Thevetia peruviana, Jatropha curcas and Hervia Brasilensis(Rubber) were extracted and transesterified. The oil and biodiesel yields were; Neem, 97%, Mango, 90%, Thevetia 98%, Jatropha, 95% and Rubber, 92%. Analysis of the biodiesel and their blends showed that Neem oil biodiesel (NOB) had highest Cetane number of 66 at 20% blend, among the biodiesel, ROB 65 at 100% blend, JOB 60 at 10% blend, MOB 60% at 100% blend, TOB 60 at 100% blend, while petrol diesel had 50 at 100% blend and it’s the lowest. Analysis of other parameters shows that the Biodiesels and their blends displayed encouraging results as energy resources. Thus the investigation shows that biodiesel and its blends can be a good alternative energy source to petroleum diesel, technically and environmentally.