Slack was among the participants as the application communications technology developer raised $16.2m to more than double its overall funding to $30m.

Nylas, a US-based developer of communications software development technology, received $16.2m yesterday in a series B round that included Slack Ventures, a corporate venturing subsidiary of communications platform developer Slack.

The round was led by Spark Capital, a venture capital firm that is also a partner of Slack subsidiary Slack Fund, and included Industry Ventures, ScaleUp, 8VC, Great Oaks Capital, Rubicon Venture Capital and JC2 Ventures.

Nylas produces software that helps developers connect applications to functions like email, calendar and…