A cambion is a male half-human/half-demon, which was introduced in the 1e Monster Manual 2 and updated for 2e. The half-fiend template is the 3e/3.5e equivalent. Female half-demons in 1e were called Alu-Demons (and were half succubus).
Yugoloths are 1e NE daemons (not demons), native to Hades. They are mercenaries in the Blood War, if you subscribe to that cosmology.
"Old school" daemons, demons, demodands and devils can be found in Necromancer Games' Tome of Horrors (3.0).
Green Ronin's Book of Fiends 3.5e includes a variant version of daemons as tempters embodying the seven deadly sins. Also the book includes demons and devils, plus unholy warriors as a PC core class.