Official Resources:

IOTA Homepage

IOTA Ecosystem

IOTA Qubic

Official IOTA Blog

IOTA Github

IOTA Wallet Repository

IOTA Docs

IOTA Learn + Tutorials

IOTA official Twitter

IOTA Subreddit

IOTA Trading Subreddit

Newsletter Sign-up

Bitcointalk Announcement Thread

Whitepaper (updated April 2018)

Japanese Whitepaper

Chinese Whitepaper

Development Roadmap

Ecosystem Fund with F6S

Transparency Compendium

Reddit AMA (June 2017)

Area 51 proposal (Stack Exchange)

Unofficial Resources:

Software/pages (not official, not tested by Tangleblog.com):

Exchanges:

Bitfinex (no referrer link here)

Binance.com (no referrer link here)

Okex (no referrer link here)

Coinone (no referrer link here)

Huobi.pro (no referrer link here)

All Exchanges on coinmarketcap.com

Support / Community / Projects / Companies:

Hello IOTA

IOTA Support

Biilabs (Taiwan company working with IOTA)

Carriota ( Project by German Company Semko development)

IOTA Guide and FAQ

Eragmus FAQ

UK Cryptocurrency Guide

News:

iotajournal.io (German news page)

http://iotahispano.com/ (many interviews!)

http://publiciota.com/

Chris Müller on Medium

Charts:

https://coinalyze.net/iota-live-price-charts/

Tradingview

Coinmarketcap

Cryptowatch

Tools:

IOTA Index Linklist

IOTA Unit System

Der Marki Converter

Laurance Tennant Tools

Felix Seele Tools

Convert IOTA

Explorer and visualizer:

Tanglemonitor.com

Tangle.glumb.de

IOTA Dance visualizer

Codebuffet

IOTA Search

Tangle Tips

Tangler.org

IOTA Balance

International Websites:

IOTA 中国: iotachina.com

缠结浏览器: t.iotachina.com

IOTA API简介: iotachina.gitbooks.io/iota-api

IOTA Italia: iotaitalia.com

IOTA Romania: https://iotatangle.ro/

IOTA Brasil: http://www.iotabrasil.com/

IOTA 한국: blog.naver.com/iotakorea

IOTA 日本: lhj.hatenablog.jp/entry/iota

News Feed: iota.news [en]

IOTA 新闻: iota.news [cn]

Special Topics

IOTA Distribution (August 2017)

Tangleblog Youtube

https://pay-with-iota.org (helpful page of shops that accept IOTA as payment)