#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

Concordium Incentivized Testnet 3 was launched today, it will last 6 weeks. Participants need to complete various challenges and submit results to Github.
#Concordium

Sentinel incentivised testnet ended for validators. Now you can stop your nodes. Rewards will be calculated with some nuances and will pay after the end of all campaign.
The last part of testnet just for bug finders. It's extended until November 17th 2020.
#Sentinel

The Fetch.ai incentivized testnet will be held from October to February.
The first phase for application testers - from 22 October to the end of November.
The second phase for node operators - end of November to end of January.
The third phase for oracle developers - end of January to mid-February.
#Fetch

The second part of HOPR incentivized testnet, named Basòdino, will start tomorrow 21 October at 13:00 UTC and will run until 4 November. Prize fund 200K HOPR for top 200 participants.
#HOPR

The first part of incentivised action from Fetch started. But for participation in this Agent World 1 (AW-1) you need to stake some real FET tokens.
#Fetch