The best alternatives to Pixelmator Pro are Adobe Photoshop, VPaint, and Affinity. If these 3 options don't work for you, we've listed a few more alternatives below.
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Snowflake O'Reilly Report— Design a Modern Application Data Stack
The world’s best imaging and graphic design software is at the core of just about every creative project from photo editing and compositing to digital painting, animation, and graphic design.
VPaint is an open source vector graphics editor where the shapes you draw can have shared boundaries and be intuitively sculpted. It's a prototype you can download now, but we're running a Kickstarter to turn it into a more complete product: VGC Illustration.
Professional photo editing, vector graphic design and desktop publishing apps for Mac, Windows and iPad
Driven by photographers and designers from the outset, Affinity is the new name in high quality, next-generation creative apps for professionals.
Laazy is a free tool for bloggers, designers, and content managers to simplify image preparation. If you’re sick of repetitive tasks, let Laazy quickly resize, rename, convert, and prep your graphics. Save time for the important things. Get Laazy.