These are not presented in any particular order other than from my larger to smaller bits. These are all 1/2" shank:
First bit is my single flute mortise compression spiral. I use this for most profiling tasks in hardwoods. Having a single flute allows me to run higher spindle speeds, and allow easier chip evacuation. These are called mortise compression because the upcut section is smaller, allowing downcut action on mortises, grooves and dadoes, etc. LMT/Onsrud
Next we have a PCD rougher/finisher. PCD stands for PolyCrystalline Diamond. The edge is serrated, allowing it to break up fibrous and fiber-reinforced material such as G10 Garolite. these bits can last up to 100 times as long as carbide in such material. Normally super expensive, you can find them at deep discount on eBay. LMT/Onsrud (retail: $615(!), ebay: $49)
Third bit is a 2-flute downcut rougher/finishser. The downcut keeps a nice finish on the top surface, and the serrated flutes break up the chips, allowing the bit to cut without excessive force (or allowing higher feedrates). These can also be used for pocketing and mortising, and I use these normally on hardwood and hardwood plywood.
Fourth bit is a wide mortise bit. I use this as a spoilboard surfacing bit, as a dedicated one can run upwards of $200-$400. This cost under $50. Amana
Fifth bit is an insert V-bit, 90 degree. The idea is that since the carbide is not brazed, it can be made of a harder compound, and thus can stay sharper longer. The carbide is also reversible and sharpenable on the flat. As unwieldy as it looks, this bit is actually well-balanced and leaves an excellent finish. And unlike many tipped V-bits, this one comes to an exact point. Amana
Sixth bit is a 1" core-box bit. I use this for general carving and shaping of smooth curvevd surfaces, as this leaves smaller scallops than a smaller bit.