Monero

March
0.12.0.0 Lithium Luna released
April
GUI 0.12.0.0 Lithium Luna released
New Proof of Work CryptoNightV2
Network upgrade to increase minimal ringsize to 7, integrate multisig, subaddresses, and change PoW algo
Getmonero.org Localization in French and Polish
May
0.12.1.0 Lithium Luna released
June
Ledger Hardware Wallets Support
0.12.2.0 Lithium Luna released
July
0.12.3.0 Lithium Luna released
GUI 0.12.3.0 Lithium Luna released
August
Kovri alpha release
Getmonero.org Moneropedia open for Localization
Getmonero.org Localization in Arabic
October
0.13.0.2 Beryllium Bullet released
GUI 0.13.0.3 Beryllium Bullet released
New Proof of Work CryptoNightV3
Implementation of Bulletproofs to reduce transaction sizes
Network upgrade to increase minimal ringsize to 11, integrate Bulletproofs, update fees calculation algorithm, and change PoW algo
0.13.0.4 Beryllium Bullet released
November
Monero Research Lab Papers 8 and 9 published
GUI 0.13.0.4 Beryllium Bullet released
Monero Research Lab Paper 7 published
December
Monero Research Lab Paper 10 published
Implementation of Monero Messaging System (MMS) to automate multisig wallets information exchange

February
Getmonero.org Localization in German
0.14.0.0 Boron Butterfly released
March
GUI 0.14.0.0 Boron Butterfly released
New Community Crowdfunding System (CCS) to replace the Forum Funding System (FFS)
0.14.0.2 Boron Butterfly released
New Proof of Work CryptoNightR
Getmonero.org Localization in Brazilian-Portuguese and Dutch
May
DLSAG: Non-Interactive Refund Transactions For Interoperable Payment Channels in Monero
July
Blockchain pruning
Trezor model T support
Ledger Nano X support
Tor & I2P CLI wallet integration
Multisig Messaging System
October
Localization platform change: from Pootle to Weblate
November
Pay for service system using mining (RPC-Pay)
IPv6 support
Standalone (long) payment ID support removed
GUI automatic remote nodes discovering and switching option
New Proof of Work RandomX