The OriginTrail ecosystem is centered around the OriginTrail Decentralized Network (ODN) mainnet, which is the main network with the full protocol implementation, launched in December 2018. In March 2021 the ODN has become a multichain network, expaning its consensus layer to the xDAI blockchain, enabling the users to choose which network to utilize based on their requirements. Upcoming integration with the Polkadot parachain is expected in the second half of 2021.
The ODN Explorer is a tool to search data on the DKG: https://explorer.origintrail.io/ Here is also a short demo explaining how to use the ODN network explorer: https://www.youtube.com/watch?v=DM3XNmWMu0c
Furthermore, you can utilize the community built OT Hub, which tracks data uploads on the network here: https://othub.origin-trail.network/dashboard
There are currently two testnet networks available to experiment with the network, and build applications and solutions.
Warp Testnet (the canary testnet for early testing of new features) - this network is for early releases of the upcoming versions of DKG node implementations. It is used as a fast paced environment, focusing on speed of testing
Stable Testnet - this testnet runs the same implementation as the OriginTrail mainnet, and is used for final release testing prior to hitting mainnet