一個簡單粗暴的轉發：大波免費icon

原地址和更具體的介紹（也沒有很具體）：Free icons for product design

來自InVision的blog。

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- The Noun Project

- Flat Icon

- Find Icons

- Icon Archive

- Icon Gallery

- Flat Graphic Design Icons

- Metro UI Icon Set

- Flat Icons (PSD)

- 48 Flat Designer Icons

- 168 Custom Interface Icons

https://dribbble.com/shots/1029199-Flat-icons-PSD-3-Dribbble-invites- 38 flat-line ecommerce icons

- Plex

- Free Flat Style Icon PackVarient Flat Custom CS Icons

- Hex Icons Pack

- Climacons

- Free Line Icon Set

- Free Flat Icons

- Product Icons

- Elegant Mobile App Icons

- Retina-ready Circle Flat Icons

- 24 Circle Social Media Icons

- Social Icons from Icons8

- New Social Media Icons

- Buttonz

- Social Network Buttons

- Social Media Icon Stickers

- Premium Flat Social Icon Set

- Triangle Vector Icons

- Social Media Badges

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話說我要出本教PPT的書（厲不厲害！雖然小時候以為自己會出言情科幻小說集……），裡面也會有一些免費圖標資源，但是我覺得嘛，盯住一個大庫（比如flaticon或者noun project），還不夠的話用關鍵詞搜也很方便啦。