Hi John, it's nice hearing from you too. reptilezs pretty much covered all the tools. I'm still new to bike repairs so I just bought what are needed to perform the maintenance on my bike.
Belows are the descriptions of some of the tools:
- The wrench with the two "half-moons" is the Hozan lock ring wrench. It is used to remove the lock ring on the bottom bracket.
- The black pliers (IceToolz) (fourth hand tool) are used to hold the brake or derailleur cable to assist the adjustment. It can also be used to tighten zip ties

- The red pliers are just a pair of Knipex wire rope cutter. I like this one a lot as it makes a really clean cut and does not fray the cable.
- The blue pliers (Park Tool) are the masterlink pliers. It's used to remove the masterlink from the chain.
- The blue plastic box is the Park chain cleaning tool. It has some brushes inside to clean the chain and does not make a mess.
- The long bar is the Park DAG-2 hanger alignment tool. As the name says, it is used to adjust the derailleur hanger. You may need this tool if you drop the bike on the rear derailleur side and bend the hanger.