Analyzing historical data can be a headache. This is especially true when you want to show data trends over time. Salesforce’s Reporting Snapshots can help; but it's a hassle to use and has more limitations than capability. Data Summaries & Snapshots (DSS) takes the ideas behind Reporting Snapshots to a new level. With DSS, you can:

• Summarize data from any number of sources to the same record giving a comprehensive view at a moment in time.
• Nearly no limit to the number of child records you can summarize. (Reporting Summaries is limited to 2,000).
• Control the order in which summaries run, allowing you to build multiple levels of summaries based on previously summarized data.
• Configuration was inspired by DLRS so easy to setup.
  
• Do basics like, count, min, max, and average, as well as more complex operations including oldest/newest values, standard deviations, counting unique values, etc.
• Ease migrating by allowing easy retro-fitting of some types of old data; as if the tool has been in use for ages.