Trigger LibApex Trigger Framework

One small class per concern, run only for the records that qualify.

One Orchestrator per Object

List each context's handlers in plain Apex, in run order.

Populator, Validator, Writer or Dispatcher, each acting only on the records its predicate picks.

Declare parent fields and related records, with no SOQL in your handler.

Writers register DML, committed once after the last handler by default.

Switch handlers off in Apex or custom metadata, and cap recursion on update.

Run handlers in a mocked trigger context, with no trigger and no DML.