Over time since initial release, many users have worked hard to improve the game experience or Rebirth through feature addition and/or fixes. This page tries to keep a record of player work that either overtly or coincidentally became incorporated into X Rebirth over time.
Thinking back over almost 2 years means this list won't be exhaustive but it can be easily updated. The list is chronological by patch from Egosoft that addressed the theme.
Please note that the following mods/extensions are generally not recommended since they are mostly redundant for the reason they are listed. Hyperlinks are basically added to serve as monuments 
v3.60: Clean Sidebar and Main Menu by Olympian: Removed striped backgrounds ("scan line effect") to aid readability.
v3.60: OOZ ship building by ubuntufreakdragon: Did what it says on the tin - OOZ Ship Dealers became accessible via the map.
v3.50: Engineer Drone Fix by w.evans: Fixed an issue whereby docked Construction URVs were not being marked as available.
v3.50: Manager Fix by ubuntufreakdragon: Improved the way a Manager determined what a station needs, helping it to produce.
v3.50: SMUPS by w.evans: Added mining, construction & cargo drones to plot URV Forge (as of 3.60, still makes additional changes).
v3.00: Recall Player Drones by YorrickVander: This mod allowed us to order the Skunk's drones to dock back up.
v3.00: Remove spawned trade ship wares by SilverXarrow: Prevented trader spawning full of wares to improve the game economy.
What other work could we add?