A handful of big-name platforms have genuine Odoo apps or modules maintained either by Odoo or a partner, Shopify being a common example for e-commerce. No-code tools like Make, formerly Integromat, also offer an Odoo connector that handles simple trigger-and-action workflows reasonably well. Odoo also ships its own built-in automation engine, Automated Actions, for rules that trigger entirely inside Odoo's own data, which solves a different problem than reaching an outside tool.
Past that, coverage thins out fast. SAP, BigQuery, industry-specific tools, and most smaller platforms have no official Odoo connector at all. For those, and for Make-style automations that outgrow simple triggers as volume or logic gets more complex, the sync has to be built directly against Odoo's own API.