These are official Lavigny's Legion sister sites or tools. It is recommended you make use of them to better work with your fellow Legionnaires.
Discord - Official Discord Voice/Text chat channels for PC and Xbox Legion members
Inara - Official Inara wing, for fleet management, trading tools and pilot tracking
Frontier Development owned and otherwise useful page about Elite Dangerous, Support and the Elite Community at large.
Elite Community & Status - Game news and server status
Elite Dev Tracker RSS - RSS Feed of latest posts from FDEV staff on Elite Forum
Elite Galnet News - Official in game news stories and player submitted articles
GalNet RSS - GalNet RSS Proxy, because the official RSS feed is buggy
Elite Forum - Official FDEV forum for discussion of Elite Dangerous
Elite Wiki - Unofficial Community Wiki for Elite Dangerous
Elite Bug Reporting Forum - Search for and report game bugs
Elite Support - Knowledge base, support requests, and bug reporting
Reddit is where many commanders and factions coordinate with each other, perhaps even more-so than the Official Frontier Forums as it is much easier to navigate through all the relevant posts and cross-post when needed.
/r/EliteLavigny - The Power Play Reddit for ALC, many sister groups participate here
/r/LavignyInquisition - Collective of Imperials that focus on the Background Simulation
/r/TheImperialCoalition - Imperial factions working in cooperation with each other
/r/ImperialHighCommand - Imperial factions working in cooperation with each other
/r/EliteDangerous - The main Reddit for all of Elite Dangerous
These are some useful sites and tools that can help make your Elite experience more enjoyable, profitable, efficient or otherwise improved.
E:D Market Connector - Auto exports (Optional Hotkey Support) market & travel logs etc to CVS/EDDB/EDSM/INARA
FGE EDDiscovery 2 - Explorer travel tracker, prospecting and cataloging tool, exports travel logs to EDDB/EDSM
WaveScanner.Net - Examples of SRV Wave Scanner detection profiles
Coriolis - Online ship outfitting tool, compatible with Inara fleets
EDSM - Travel tracking, compatible with Market Connector
EDDB - Trade route calculator
Fuel Rats - Community driven emergency refueling service for ships in distress