Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.

Turnitin - Turnitin is preferred by educational institutions around the world for preventing plagiarism. Instructors at all levels of education can request that students use the service to submit papers, and Turnitin checks those papers for plagiarism.

TeXworks - The TeXworks project is an effort to build a simple TeX front-end program (working environment)...

Unicheck - The plagiarism checker Unplag scans across the internet, repositories, open sources content and databases. It delivers real-time results and has no cached data.

TeXstudio - TeXstudio is an integrated environment for writing LaTeX documents.

PlagiarismSearch - PlagiarismSearch is online service that detects plagiarized content.