Now... I have tried some space-sims/games out there. Some are cool, some are dull. But none of them offered the option to expand, change, modify, or alter the game and its inner workings like Oolite - not that I know of anyways. For that alone, this has got to be the most awesome space sim I have come across.
The list of OXP's
is quite extensive I have to say... The in-game expansion manager tells me there are some 500 of them readily available for consumption. That's some number. Apart from some obvious must-haves, such as Griff's retexture pack, background sets, realistic stars, etc., I reckon there are some "core OXP's" the more experienced/skilled Commanders among you are using.
I'm curious about the OXP's being used... I have installed about 80 of them now - but only because some have dependencies. Most notable are Xenon UI, Ship Configuration (yes, I kinda like the realism and trade-offs it brings with it), Planetfall and its add-on's, New Cargoes, Superhub, Variable Mass-Lock, and others.
I'm also curious if you use multiple Oolite installations with different sets of OXPs to vary the experience.
As you can see I'm pretty enthusiastic about this little gem of a game I found here!