Unfortunately, I'll have to decline this one.... it's a Triratna/FWBO site. Nothing against them, but the search engine is specific to Theravada.
Alas this means that even excellent sites like Buddhanet with a lot of Theravada content cannot be included in whole, because including them in whole would also automatically include their Mahayana content.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)