Recently bought A600, mainly for tracker software and games. I equipped it with 4GB CF card as hard disk, WB2.1 installed.
I found an old version of DOpus that works on this system and I installed lha for start.
What else could I install to improve functionality (and look)? ClassicWB requires KS3.1, not sure about ScalOS?
Please post some suggestions. I'm not asking about your favourite multimedia applications, just some tools, desktop enhancements.
I was using Amiga almost 20 years ago, so you may consider me as newbie 
I have only 1MB of RAM but planning upgrade. Sooner or later I will install 3.1 rom but I'm curious what 2.05 rom is capable of.
What do you want to do?
Many things will run now. Most anything can technically run on your setup after you add some more fast ram. It might be slow with more demanding programs, though.
Ordering is faster than Dopus. Visage and Viewtek are good image viewers. Mp3s sound good with a parallel port player. All of the productivity software (Finalxxxx, etc) will run on your machine as will Distant Suns and DigitalUniverse. So will most graphic arts stuff. You can run a 16 color workbench and customize it to your heart's content. There many screen savers, icon sets, palettes, and even an animated pointer (2.xx only) that run under 2.xx. There is a whole world of programming and sound and music open to you. And there are games.
There are many here who have done fantastic things with an Amiga like yours. (Camy, Mr.500, etc. Look at their screen shots.)
