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PDF command line written in pure Go with almost no external dependencies: dozens of subcommands to merge, split, crop, rotate, watermark, encrypt and decrypt, extract images and fonts, and work with forms.

WhatsApp CLI: pair as a linked device, sync messages to local SQLite, search offline, send text and files, and manage groups, with --json output for agents. Built on the unofficial WhatsApp Web protocol.

Community-maintained Slack MCP: reads channel, DM and thread history, searches messages and fetches unread messages; write actions like posting are off by default and must be enabled explicitly. Works with user OAuth or bot tokens over stdio, SSE or HTTP.