These two mods are of a kind we haven't really seen before; changes to The Playground. The Playground is, all things considered, a pretty useless mission unless you happen to be testing something, and these mods aim to change that.
The first, HyperFighter's Bully in the Playground, transforms The Playground into an intense close-quarters Instant Action battle with a CCA force. With the enemy base so close to your own you'll find yourself running into their forces on a regular basis, and will need to work much faster than you normally might to defend yourself against their attack runs.
The second, DeusExCeteri's Soviet Playground, does pretty much as its name implies; where the original Playground lets you acquaint yourself with the NSDF's technology, this version lets you check out the Soviets' toys. (And it's on Venus, as you might expect from the CCA.)
It's worth noting that these mods won't work as intended if you try to activate them at the same time.