GitHub - yaoweibin/ngx_http_substitutions_filter_module: a filter module which can do both regular expression and fixed string substitutions for nginx
GitHub - openresty/replace-filter-nginx-module: Streaming regular expression replacement in response bodies
GitHub - intaro/nginx-image-filter-watermark: Patched image_filter module for Nginx with watermark ability
![Transforming and sending Nginx log data to Elasticsearch using Filebeat and Logstash - Part 2 | Kraken Systems Ltd. Transforming and sending Nginx log data to Elasticsearch using Filebeat and Logstash - Part 2 | Kraken Systems Ltd.](https://krakensystems.co/assets/images/uploads/2017-12-15-timinglogs.png)