Hard to believe people are suggesting these are worthless! Admittedly they aren't worth a fortune but definitely not worthless.
When I go to the various engineering shows and autojumbles stallholders often have trays of HSS almost always for sale at £1 each.
I would sort them into similar sizes (shank size), type and brand. Bundle them up in 10s, 15s or 20s and sell them as lots.
The better brands, Eclipse, Cleveland, Osborn, Presto etc will sell fairly easily I would have thought. Even the smaller pieces have some value. Plenty of micro lathe users out there wanting small 1/4 inch bits.