Space Battles... Naa... Intergalactic Racing!
This planet was a hair-pin turn for intergalactic racing. Nail the gravitational slingshot just right and you're almost assured a 1st place victory - miss it by even a 1/100 of a degree and you're in for a bad day.
Interest in this planet was originally generated when a space (similar to the Voyager) probe was found wandering the outskirts of the known civilized galaxy. The probe not only housed the location of this planet but also a comprehensive bank of detailed genetic models, and many of the models were recreated to build working versions of the planets inhabitants. In particular, life forms were created / modeled after what were believed to be the creators of the probe, and they were later referred to simply as The Probes.
With automation as it was in the galaxy, rather than The Probes being used as slaves, instead they were replicated more as pets and zoo attractions. But as their numbers grew, so too did their desire for independence and desire for self determination. Many died as a consequence of these desires until finally, accords were drafted providing The Probes with a quasi-independent status.
Once permitted a certain level of freedom and the ability to contemplate for themselves a brighter future, many of The Probes were curiously drawn to the past and worked tirelessly to devise a means of traveling to the origin of their dna. When finally they arrived, they found that the planet was barely habitable as it seemed that many hundreds (if not thousands) of years prior, the planet suffered from catastrophic war with many land masses still reflecting high levels of radiation.
Nevertheless, news of the planets (re)discovery sparked wonder in the Galaxy and the planet served as somewhat quasi-homeworld for the genetically (re)created species, so much so that the planet was declared a Galactic Heritage site. It goes without saying however, had the planet been ripe for exploitation (i.e., not adversely radiated), it would have been stripped of its resources, like so many other worlds before it (the planets distance from the Civilized Galaxy also helped keep it safe and in its less than "pristine" condition).
Over time, the interest in the planet waned as newer stories occupied the headlines. One such story was the creation of the Intergalactic Races which would serve as a bridge between the varies alien species throughout the known galaxy. The course would encompass many of the base solar systems for many of the major alien races. The Probes saw this as an opportunity to reignite interest in their newly discovered homeworld and petitioned the Intergalactic Racing Committee to consider their planet as a way-point for the race. For a number of reasons (for example: guilt over their exploitation of the Probes, the somewhat newness of the planets (re)discovery, along with the many other recreated creatures from the dna store), the planet was added to the course.
This segment of the race was by far the most dangerous race checkpoint. It was one of the furthest points from the start/finish line and most ripe for cheating. Many of the most infamous racers were said to employ some sort of nefarious tech to undermine the competition, particularly on the far side of the planet where the flyers were moving at their fastest, barely skimming the atmosphere in hopes of achieving record times. Many ships were lost there, and the losses were generally attributed to "bad" flying - but of course everyone knew (or at least suspected) foul play at hand.
Because of the hazards associated with this segment of the race, the planet was highly monitored to prevent any sort of technology being deployed to the surface - the planet was marked strictly off-limits to any and all alien species. These safeguards helped to prevent alien tech from deployment to the surface which might have provided advantage for some, and detriment to others.
However, tech DID manage to reach the surface - those unfortunate racers "unable" to ride the Razors Edge ultimately found their speeders plummeting to the planets surface: sometimes pilots were able to pod out in time, but many times pilots ended up escorting their fiery craft to the surface - either way, galactic law prevented any and all salvage operations.
Rumors of pilots intentionally crashing their flyers into the planet grew over time, supposedly attempting to deposit illegal tech to be leveraged on future races, as circumstantially evidenced in more recent years of the race where a select number of racers bailed out of their crafts in preliminary races (their flyers spiraling seemingly "out of control" towards the planet surface), but they however miraculously escaping certain death and later in the season, winning Grand Championships.
As such, a growing sentiment for inspectors to visit the planet surface took life, but while the quarantine laws were in place, the probability of inspection was grim (as was the prospect of living aliens interacting with the locals).
The races came to an end by the onset of galactic war, which was brought on by petty trade disputes. Perhaps one day the races may resume, but the isolationist policies that most alien species embraced after the war would need to drastically change.
Flyers have an extraordinary amount of tech. Examples: Communications, Life Support (including reclamation tech for reprocessing pilot waste), Composite Materials, Avionics, Propulsion (with types of fuel), Navigation (including short range Radar), Tracking Modules(used by Race Officials to map flyer movement), Computers, Neural Interfaces, Exotic Metals, Low Density Structures, Batteries, etc.
For each alien species in the race, you can expect one (or more) different flyer makes and models. Assuming you have five alien species flying, it's conceivable that each species brings to the table at least three different models, providing a varying wealth of the above technologies, and all considered Legal tech.
Legal tech, per the unfortunate demise of unlucky racers, was generally salvageable (to a lesser degree anyway) by the locals. If only for ornamental decoration, the inhabitants scavenged this substandard tech to adorn their vehicles, dwellings, etc. Of course some of it too, did manage to survive.
Regards the illegal tech, you can infer flight plans to the planet surface for those flyers was mapped to be less harsh so that the outlaw tech survived more frequently (and was therefore more easily plundered by the locals). Of course when it got scavenged, no one complained since illegal tech "is not" being deposited on the planet surface.
Those aliens unfortunate enough to accompany their crafts to the surface will have implants allowing them more fluid control of their vessels, and it could be harvested and utilized to control the salvaged tech.
Since a host of aliens from different species have crash landed, they bring from their respective worlds: dna/parasites/germs/bacteria/disease/etc. The introduction of alien organisms could account for genetic drift within the local population.
Different alien species also used their unique brand of technology (i.e., different methods of propulsion, etc.), some of which not so friendly to unprotected DNA, and that too caused genetic drift, especially when components of drive systems (for example) were salvaged and used to augment native based drive systems.
Some pilots did survive and built a life for themselves on the surface. Those with a dna signature close enough to the locals managed to mate the locals. The Probes for example were close enough in dna sequencing to permit mating and that also helped in promoting genetic drift.