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

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

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

Online file converter for audio, video, document, ebook, archive, image, spreadsheet, presentation