Not sure if 2005-2010 is a requirement or a suggestion, but here is a list of older Mac games that I love and still play:
Warcraft III: Reign of Chaos (2002) - While I have the Original and WCII, WCIII really got me hooked in the WC lore. Such a fun game and I love the custom games. I come back to this every couple years, and play it for a month or two.
Warcraft III: Frozen Throne (2003) - Almost as fun as RoC. I listed this separate, because I don't play the expansion nearly as much as the original.
Castles II: Siege and Conquest (1994 Mac CS-ROM version) - I come back to this about once a year or two. I purchased the Mac version in the 90's and still have it. I sometimes play it on my 2001 iBook G3 that I still own. A few years back, I purchased the version on Steam so I could play on my modern Mac, but it was based off of the 1992 DOS floppy disk version, which sucked. I decided to install a MacOS 9 emulator to play the original Mac version on my modern Mac.
WoW (Classic) - not sure if this would be considered old, but I play it sometimes.
WoW (Retail) - Again, not sure if this would be considered old, but I will play it sometimes. I used to play it a lot especially mid 2000's to mid 2010's. Playing for the sub non-stop them, for over 10 years. In 2016, my youngest daughter was born premature and both her and my wife was in the hospital for months. I slowed my playing then, and took a break right before Legion. A few years later, I played again, doing most of the Legion content, and some of the Shadowlands content. Took another break, not sure how long, maybe forever.
Sim Tower (1994) - Play this every couple years. Just a fun game. There was a sequel called Yoot Tower, basically the same as Sim Tower, just more polished. It was released on a bunch of platforms, I got the iPad version.
Chuck Yeager's Air Combat (1991) - I play this every once in a while, only for a day or so, not for very long. It is super fun, and the custom games can be insane.
A-10 Attack! (1995) - Better graphics than Chuck Yeager's Air Combat, but like it, I usually just play this for a few hours, then take a break for a few years.
Lux (2002) - Similar to the board game RISK, but with different maps. I have not play Lux in a while because the game RISK was launched on the tvOS back in 2017, and had multiple maps and nice graphics and sound. Plus, I could play from my recliner chair. A few months ago, the developer of the RISK game stopped supporting the tvOS version and pulled it from the tvOS App Store (tvOS gaming developers are leaving the platform like crazy). So, I might end up going back to Lux for my RISK habit.
There are probably a few others that I play every now and then, but those are the ones that I go back to the most.