Polkachu : Always look here first to see if they offer resources for the chain you are working with. They offer snapshots, state sync settings, peer lists, address books, etc., Bookmark this site before any other.
ansible : IT automation for simplified node/server deployment. You can check Lavender.Five's forks of Polkachu's Ansible setup for validator setup, secure setup, and horcrux.
cosmprund : Incredible tool that helps compress your chain history.
Cosmovisor : Process manager for Cosmos SDK binaries
Tenderduty : Validator notification tool for Cosmos validators by Blockpane.
Zabbix : Monitor the server(s) running your nodes. Also check out cosmoszab, a useful set of configurations and information on using Zabbix with Cosmos