Code::Stats

Open-source plugins for metrics about your programming

JIRA is a proprietary issue tracking product that allows bug tracking and agile project management

Clockify's REST-based API can be used to push/pull data to/from it & integrate it with other systems

Convert, merge, split, extract text and add page numbers for PDFs. Free for 250 documents/month

Generate PDF documents from templates with a drop-and-drop editor and a simple API