This is the basic game without any added OXPs. If you choose Strict Game when you start up Oolite, this will constrain you to the basic vanilla game, excluding whatever OXP/OXZs you may have loaded.
The strict game before Oolite v.1.80 was a mildly modified version of Classic Elite - thus lacking Fuel Injectors, anti-ECM missiles, shield boosters, scanner targeting enhancements, contract hauling, the F5F5 cargo hold screen, no F3F3 shipyard, no navigation beacon, no stopping at a standstill, etc. etc.). But it did have the Energy Bomb which has been replaced with the Quirium Cascade Mine!