SolrMeter is still available for download but it's currently not under development.
What is SolrMeter?
In one sentence
Standalone java tool for stress tests with Solr.
In more than one sentence
The main goal of this open source project is bring to the solr user community a generic tool to interact specifically with solr, firing queries and adding documents to make sure that your Solr implementation will support the real use. With SolrMeter you can simulate your work load over solr index and retrieve statistics graphically. Dive into the wiki to read more about SolrMeter...
Want to use it?
Check the Usage page in the project wiki.