Build the OAuth2 authorize link that installs your bot or app, with scopes, permissions and redirect options checked as you go.
Discord Webhook Sender
Post a JSON message to a Discord webhook, or look up and delete the webhook, with requests going straight from your browser to Discord and the URL never stored.
Discord Permissions Calculator
Tick Discord permission flags to build the integer for a bot or role, or paste an integer to see which flags it grants.