A work-in-progress custom microcontroller licensed under the TAPR Open Hardware License (tapr.org/OHL) and kept fully open source, forever.
The schematic for Revision 0.5(not the Gerber file) is in /SCH_Aether Zero_R0.5.json as an EasyEDA file, which you can open at https://easyeda.com/editor and if enough people want it I will provide it in other formats.
The PCB design for Revision 0.5(not the Gerber file) is in /PCB_Aether Zero_R0.5.json as an EasyEDA file, which you can open at https://easyeda.com/editor and if enough people want it I will provide it in other formats.