Picdiet-在线压缩

开源的化学分子式编辑、查看、绘制工具，包含了化合物、蛋白质、光谱数据库。MolView is an intuitive, Open-Source web-application to make science and education more awesome!

它是国外免费分享网站,大量版权过期而进入公有领域书籍的一项协作计划。

需翻墙-国外一个免费模型分享网站，囊括了各个领域和多种三维设计软件、素材。GrabCAD is the largest online community of professional engineers, designers & students. Learn about our 3D printing software GrabCAD Print & GrabCAD Shop

提供免费的640×480视频剪辑，可以购买的HD和4K素材。Free Stock Footage and Commercially Cleared Royalty Free HD & 4K Stock Footage..

图片可免费商用，去做点了不起的事吧！Startup Stock Photos are free startup, office, and tech stock photos ready for your next project. Used by millions. Make something awesome.

享拥有180种渐变配色方案的网站，里面有很多格式供设计师选择。Come to WebGradients.com for 180 beautiful linear gradients in CSS3, Photoshop and Sketch. This collection is curated by top designers and totally free.