10 classes are annotated with Condition in Drupal 8

BaloneySpam in core/modules/block/tests/modules/block_test/src/Plugin/Condition/BaloneySpam.php

Provides a 'baloney_spam' condition.

ConditionTestDualUser in core/modules/system/tests/modules/condition_test/src/Plugin/Condition/ConditionTestDualUser.php

Provides a condition that requires two users.

ConditionTestNoExistingType in core/modules/system/tests/modules/condition_test/src/Plugin/Condition/ConditionTestNoExistingType.php

Provides a condition that has a no existing context.

CurrentThemeCondition in core/modules/system/src/Plugin/Condition/CurrentThemeCondition.php

Provides a 'Current Theme' condition.

Language in core/modules/language/src/Plugin/Condition/Language.php

Provides a 'Language' condition.

MissingSchema in core/modules/block/tests/modules/block_test/src/Plugin/Condition/MissingSchema.php

Provides a 'missing_schema' condition.

NodeType in core/modules/node/src/Plugin/Condition/NodeType.php

Provides a 'Node Type' condition.

OptionalContextCondition in core/modules/system/tests/modules/condition_test/src/Plugin/Condition/OptionalContextCondition.php

Provides a condition with an optional node context.

RequestPath in core/modules/system/src/Plugin/Condition/RequestPath.php

Provides a 'Request Path' condition.

UserRole in core/modules/user/src/Plugin/Condition/UserRole.php

Provides a 'User Role' condition.