docs: edit README

README.md

@@ -7,7 +7,10 @@
 ## 实用信息
 
 - [免费电子书](https://github.com/ruanyf/free-books)
-- [谁在招人](https://github.com/ruanyf/weekly/issues/692)：免费的程序员招聘服务
+- [免费音乐](docs/free-music.md)
+- [免费照片](docs/free-photos.md)
+- [免费软件](docs/free-software.md)
+- [谁在招人](https://github.com/ruanyf/weekly/issues/798)：免费的程序员招聘服务
 
 ## 2019
 

docs/free-music.md

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+# 免费音乐
+
+以下音乐库网站提供免费音乐，可以用于商业用途。
+
+- Bensound：[https://www.bensound.com/](https://www.bensound.com/)
+- WOWA：[https://www.wowa.me/](https://www.wowa.me/)
+- Incompetech：[https://incompetech.com/music/](https://incompetech.com/music/)，[https://incompetech.filmmusic.io/search/](https://incompetech.filmmusic.io/search/)
+- Free Music Archive：[http://freemusicarchive.org/](http://freemusicarchive.org/)
+- CCMixter：[http://ccmixter.org/](http://ccmixter.org/)
+- Jamendo Music：[https://www.jamendo.com/](https://www.jamendo.com/)
+- Free Loops：[http://free-loops.com/](http://free-loops.com/)
+- Freesound：[https://freesound.org/](https://freesound.org/)
+- Internet Archive’s Netlabels Collection ：[https://archive.org/details/netlabels](https://archive.org/details/netlabels)
+- Jukedeck：[https://www.jukedeck.com/](https://www.jukedeck.com/)
+- Sound Image：[http://soundimage.org/](http://soundimage.org/)
+- Sound Bible（音效网站）：[http://soundbible.com/](http://soundbible.com/)
+- [Public Domain Info](https://www.pdinfo.com/royalty-free-music.php)

docs/free-photos.md

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+# 免费图库
+
+下面都是图库网站，提供免费的商业级高清晰度图片下载。
+
+- [Unsplash](https://unsplash.com/)
+- [Pexels](https://www.pexels.com/)
+- [Gratisography](https://gratisography.com/)
+- [picjumbo](https://picjumbo.com/)
+- [Pixabay](https://pixabay.com/)
+- [Canva](https://www.canva.com/photos/free/)
+- [reshot](https://www.reshot.com/)
+- [rawpixel](https://www.rawpixel.com/)
+- [Morguefile](https://morguefile.com/)
+- [pxhere](https://pxhere.com/)
+- [ISO Republic](https://isorepublic.com/)
+- [泼辣有图](http://www.polayoutu.com)
+

docs/free-software.md

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+# 免费工具
+
+## 作图工具
+
+- [ProcessOn](https://www.processon.com/)
+- yEd：[桌面版](https://www.yworks.com/products/yed)，[在线版](https://www.yworks.com/products/yed-live)
+- [Pencil](https://pencil.evolus.vn/)
+- [Dia](http://dia-installer.de/)
+- [Inkscape](https://inkscape.org/)
+- Draw.io：[在线版](https://www.draw.io/)，[桌面版](https://about.draw.io/integrations/#integrations_offline)
+- [Whimsical](https://whimsical.co/)
+- [PlantUML](http://www.plantuml.com/plantuml/)
+- [Mermaid](https://mermaidjs.github.io/mermaid-live-editor/)
+- [迅捷画图](https://www.liuchengtu.com/)
+- [百度脑图](http://naotu.baidu.com/)
+- [Visual Paradigm Online](https://online.visual-paradigm.com)
+- [Creately](https://creately.com/)
+- [Coggle](https://coggle.it)
+
+## 视频编辑器
+
+- [DaVinci Resolve](https://www.blackmagicdesign.com/products/davinciresolve/)
+- [Shotcut](https://shotcut.org/)
+- [OpenShot](https://www.openshot.org/)
+- [Kdenlive](https://kdenlive.org/en/)
+
+## 在线代码编辑器
+
+- [monaco-editor](https://github.com/Microsoft/monaco-editor)
+- [code-server](https://github.com/codercom/code-server)
+- [StackBlitz](https://stackblitz.com/)
+- [Theia](https://www.theia-ide.org/)
+