The same Slack Development channel is also available on the Gridcoin Rocket.Chat (https://chat.gridcoin.io).
The Discord Development channel is being archived for now. The developers have chosen Slack/Rocket as the preferred messaging platform for their day-to-day development chat. Everyone is still welcome at the Gridcoin Discord for all discussions (https://discord.me/gridcoin).
We'd be happy to have anyone in any of our community discussion venues.
RE: Gridcoin Development Is Now Only Available On Slack!