SpeedLight can be used for free but also has a commercial part.
By default, your SpeedLight avatar is free: you can use the web viewer but with some limitations.
You can make your avatar Gold for L$1990 per month. This reveals the premium features (keep avatar online 24/7, schedule notices, send mass IMs).
Remember that Gold members help us developing SpeedLight! Thank you for your help!
To make your avatar Gold, login and click on "get more time":