Client Libraries
JDBC (Yandex): https://github.com/yandex/clickhouse-jdbc
Go drivers:
C++ driver: https://github.com/artpaul/clickhouse-cpp
Ruby driver: https://github.com/archan937/clickhouse
Scala driver: https://github.com/crobox/clickhouse-scala-client
Spark connector: https://hub.docker.com/r/dmitryb/clickhouse-spark-connector/
PHP wrapper: https://github.com/smi2/phpClickHouse
UI Tools
Tabix: https://tabix.io
CLI client: https://github.com/hatarist/clickhouse-cli
3rd-party integrations
https://grafana.com/dashboards/869
https://github.com/Vertamedia/clickhouse-grafana
https://github.com/cloudflare/sqlalchemy-clickhouse
https://github.com/lomik/graphite-clickhouse