After more than a quarter of a century, RGBDS—the most popular community-developed assembler for the Game Boy—hit version 1.0.0 last week! https://github.com/gbdev/rgbds/releases/tag/v1.0.0
I maintain a Visual Studio Code extension for RGBDS, and I just released a major update to pair with it. https://marketplace.visualstudio.com/items?itemName=donaldhays.rgbds-z80