Offer me an open-source time-tracking software

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
This is a research work in which you are required to go through open-source software on the market, analyze it and offer a version which fit the requirements below. No development work is required.

There are many time-traking software variants are there on the market. I need software with following features:
1. Support multiple users.
2. Have web ui.
3. Captures desktop screenshots. Screenshots should be taken at specified time intervals configured via web ui.
4. Easy to use.
5. Open-source.

You should present at least 3 software solutions.

Skills required:
Software Architecture
About the employer:
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