#Filecoin
Filecoin ready to start second phase of their testnet. Phase 2 is non-incentivized and the last major milestone before mainnet launch.

#Poseidon
Poseidon Network released testnet and invited Linux/NAS owners to join. 100 QQQ coins per day promised for running node.

#Near
Near Protocol started incentivized testnet "Stake Wars: Episode II Return of Validators". Main tasks for validators is up to date their nodes.

#Filecoin
Filecoin announced incentivized phase of testnet, it's a final testing for decentralized storage network mainnet. Testnet may begin as soon as early July and will run for a total of three weeks.

#Secret
Phase 1 of the Secret Network incentivized testnet will start July 20th. For starting node your motherboard and CPU must supports Intel SGX (Software Guard Extensions).

#AVA
Avalanche started Everest incentivized testnet. Just run node and make some transactions for getting rewards.

#Lyra
Lyra (project for purchaser loyalty rewards on blockchain) started testnet with rewards, which will enough to stake the node on mainnet once it’s launched.

#Meter
Attention for Meter Warring Stakes participants. For getting validator rewards you need complete KYC.

#HOPR
HOPR network in conjunction with USD stable blockchain xDai started public incentivized testnet. Prize fund 100k HOPR for top 20 participants.

21 September Solana will start stage 8 of their testnet Tour De Sol. Estimated stage duration 4 weeks. Registration closes the 20 September 8:00am PT.
#Solana

The new phase of Desmos Validators Program was launched September 21. This incentivized program running until the Desmos mainnet is launched, aprrox. 3-6 months. Rewards will be awarded on a monthly basis for node uptime.
#Desmos

NOIA releases six months roadmap for mainnet launch:
https://medium.com/noia/noia-releases-roadmap-for-launch-d56f11cc46e6
#NOIA

First part of Bifrost incentivized testnet named Asgard CC3 will start today September 24 at 04:00 UTC. Next parts will open on September 30 and October 10 respectively.
#Bifrost

Sentinel launched latest Cosmos/Tendermint based testnet Turing-3. Incentivized part of this testnet will start September 28 and continues to October 15.
#Sentinel

Celer incentivized testnet is over. Final leaderboard will be publishing in two weeks.
#Celer

Due the some issue Bifrost EOS Cross-chain Competition will be postponed at undefined time.
#Bifrost

Concordium project announced the start of incentivized testnet from October 15th to 26th of November. Participants will be able to earn rewards for performing some challenges.
#Concordium

Wanchain was launched open testnet. Approx duration - one month. Node runners may get up to 900 WAN (~ $230 for now) coins for node.
#Wanchain

Decentralised Ethereum POS network Rocket Pool launched beta testnet v.2.5. Rewards pool 10000 RPL tokens.
#Rocketpool

Bitsong incentivized testnet will start in the closest time. For getting yourself to waiting list, you need generate genesis transaction and make pull request to git repositorium no later than October 13th.
#Bitsong

Dfinance announced incentivized testnet, which planned to start at October 15th. Testnet will not only give rewards in real XFI, but also require real XFI to run validators, stake, or provide liquidity.
#Dfinance