Open Source Mac Pixel Art Software

Aseprite is a program to create animated sprites. Sprites are composed of layers & frames as separated concepts. Support for color profiles and different color modes: RGBA, Indexed (palettes up to 256 colors), Grayscale. Animation facilities, with real-time preview and onion skinning. Copy & paste. Drag & drop. Resize palette. Palette entries with alpha value. Select color harmonies. Create light and shadows with the shading ink. Create perfect strokes for pixel-art. Avoid extreme pixel distortions when rotating tiny sprites. Create patterns repeating the image in a 3x3 grid. Create custom brushes for dithering. Composite layers to create color effects. Open or save a sequence of images. Create animations and save them as .gif files. Export your work to sprite sheets in .png and .json files. Recovery your sprites in case of crash. Integrate Aseprite in your assets pipeline with the command-line interface (CLI). Store several animations in one texture atlas.

https://pixelfed.social/Thelonious

Pixel Art to CSS is an online editor that helps you with that task. Combining the power of both box-shadow and keyframes CSS properties, you will get CSS code ready to use on your site. Furthermore, you can download your work in different formats such as static images, animated GIFs or sprite-like images. Pixel Art to CSS aims to be an intuitive tool by its simplicity, however, it is equipped with a wide range of features: customize your color palette, go back and forth in time, modify animation settings, and save or load your projects, among others.