Combot
A group management bot. Its site lists analytics (messages, members, joins and leaves, top users), anti-spam that bans known spammers on join, moderation tools such as captcha, warnings, bans and read-only modes, and an AI that answers when someone mentions it.
Rose
A moderation bot built to fight spam: locks, blocklists, filters, notes, welcome messages, captcha, warnings and bans, and federations that share bans across groups.
KeeperBots
A bot that keeps up with the conversation for everyone: a summary every night, /summary on demand for any window or topic, /ask to answer questions from the group's whole history, a list of what the group decided, private keyword alerts, member stats, a join check for new members, and backup & restore.
It does not moderate: it won't mute, warn or ban anyone, or filter spam. If your group needs that, keep Combot or Rose for it. They work side by side.
Which to choose
Spam and raids are the problem: a moderation bot.
Nobody can keep up, decisions get lost, and the same questions keep coming back: KeeperBots.
Both: add both. Each does its own job.