The Little Book of Adventuring Classes - volume I-
It is a fun little OSR product stat'd up for the Swords & Wizardry Complete system, but easily adaptable to your OSR system of choice. The cover features my favorite class from the book the Deathwitch! It has 8 new classes and 5 new races. While I don't see myself using every race and class in this "little book", the ones I like, I really like and right now with it being Christmas in July you can get the PDF for $2.24 also if you are more of a print "book in hand" sort of person (such as myself) it is now available in print.
Good Gaming! -B.B.