The Influx shell is an interactive shell for InfluxDB and the recommended ad hoc method of using the HTTP API.
The built-in web administration GUI is a simple way to interact with InfluxDB. For any significant use, whether writing or querying data, the HTTP API is the preferred method.
Grafana is a convenient dashboard tool for visuallizing time series data. It was originally built for Graphite, modeled after Kibana, and since been updated to support InfluxDB. Almost all Grafana documentation for InfluxDB version 0.9 will apply to InfluxDB version 0.10.
Telegraf is an open source tool for metrics collection (e.g. CollectD) built and maintained by the InfluxDB team.