COLLECTION MANAGEMENT:
PandaViewer: https://github.com/seanegoodwin/PandaViewer/releases
HappyPanda: http://pewpews.github.io/happypanda/
Hydrus Network: https://hydrusnetwork.github.io/hydrus/

PRIORITY LINKS:
Panda Backup: panda.chaika.moe
H-links: https://dnsev-h.github.io/h-links/
Eze: https://dnsev-h.github.io/eze/
exDownloader: https://github.com/exdownloader/exDownloader
Hentai Media Resources: https://docs.google.com/spreadsheets/d/1uJzgJBGuY5Jv0xcaPwGD8lAlYueu0Z6Q4HWdy1BDDDg/pubhtml
Other Projects: https://docs.google.com/spreadsheets/d/1i-YvlRoHut-8fppoYDeiK8-NurAiAL592fcPC5Na6IA
Previous Threads: http://fgts.jp/_/search/boards/h.dis/subject/Collection%20resources/

IRC channel: #sadpanda @ rizon
Here's a link to use the rizon webchat if you don't have a IRC client.
Simply enter a nickname and then click connect.
https://qchat.rizon.net/?channels=sadpanda