I believe it's highly dependent on what you do.
For general automation: Make, n8n or alternatives: coldiq.com/#automation
To automate your outbound email sending: Instantly, Smartlead, Apollo.
To automate your inbound email campaigns: ActiveCampaign, ConvertKit.
To automate your email list building: Apollo or LinkedIn Sales Navigator + Phantombuster.
To automate your customer service: Drift, Intercome, Cohere.
To send client proposals faster: PandaDoc, Qwirl.
To organize your tasks: Asana
(...)
Definitely non-exhaustive
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