Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
TeXstudio - TeXstudio is an integrated environment for writing LaTeX documents.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
LyX - LyX is a document processor.