This (work in progress) section is intended to give you an idea of all the development that contributes to the Ethereum ecosystem, and how it has evolved, over time. I suggest doing a ctrl+f search to lookup specific topics, projects, or developers.  

Click on titles to be directed to respective YouTube DEVCON videos. Click on developer names to be directed to respective Twitter accounts (if available). 

API's:

EVM-C: Portable API for Ethereum Virtual Machines at DEVCON3 (2017) by Pawel Bylica 

Banking:

Banking with Smart Contracts at DEVCON1 (2015), Panel Discussion

Bitcoin:

BTC Relay at DEVCON1 (2015) by Joseph Chow

Blockchain Model Canvas:

Blockchain Model Canvas at DEVCON1 (2015) by Adi Chikara

Browsers for Ethereum:

Evolving the Ecosystem & a Metamask Roadmap at DEVCON4 (2018) by Bruno Barbieri, Bobby Dresser, and Jenny Pollack

MetaMask: Dissecting the Fox at DEVCON3 (2017) by Aaron Davis and Frankie Pangilinan

MetaMask Bridging Browsers to Blockchains at DEVCON2 (2016) by Aaron Davis​

Metamask at DEVCON1 (2015) by Aaron Davis

Community:

Community Outreach at DEVCON2 (2016) by Joris Bontje

Consensus/Casper/Proof of Stake

CBC Casper Design Philosophy at DEVCON4 (2018) by Vlad Zamfir

Intro to Casper Implementation at DEVCON3 (2017) by Chang-Wu Chen
Verifying Casper at DEVCON3 (2017) by Yoichi Hirai 
​Casper the Friendly GHOST: A Correct-By-Construction Blockchain at DEVCON3 (2017) by Vlad Zamfir
​
Casper at DEVCON1 (2015) by Vlad Zamfir
Challenges in Public Economic Consensus ​at DEVCON1 (2015) by Vlad Zamfir

Cryptography:

Govt Approved Cryptogoraphy to Ethereum at DEVCON3 (2017) by Kirill Ivkushkin

Currencies:

Trustlines Network: Open Protocol for Decentralized, IOU-based Currency Networks at DEVCON3 (2017) Bernd Bohmeier and Kristoffer Naerland

Data Marketplace:

Building an Ethereum assisted Decentralized Data Marketplace at DEVCON3 (2017) by Guy Zyskind

DApps:

Money is the killer Ðapp: crypto in Venezuela at DEVCON4 (2018) by Alejandro Machado & Eduardo Gomez​

Dapp Development Using Remix, Mist, and Geth at DEVCON3 (2017) by Yann Leverau

Remix and Other Ethereum Development Tools at DEVCON2 (2016) by Yann Levreau

DApp Design Patterns at DEVCON1 (2015) by Joris Bontje
DApp Store at DEVCON1 (2015) by Tim Coulter
Building A DApp (Design) at DEVCON1 (2015) by AlexVan de Sande

Decentralization:

Decentralized development: what even does it mean and should we care? (yes!) at DEVCON4 (2018) by Amber Baldet and Patrick Nielsen

DEVgrants:

DEVgrants at DEVCON1 (2015) by Wendell Davis

Development Tools:

​Truffle Development Ecosystem and Future of Ethereum Development Tools at DEVCON2 (2012) by Tim Coulter

Enterprise:

DEVCON4 (2018)​
How can the Enterprise Ethereum Alliance interoperate with the public Ethereum chain EIP process? at DEVCON4 (2018), Panel Discussion

DEVCON3 (2017)
Extending Eth with Enterprise Smart Contracts at DEVCON3 (2017) by Marley Gray

DEVCON2 (2016)
Ethereum for Enterprise at DEVCON2 (2016) by Victor Wong
Fast and Scalable Blockchain for Enterprise Users at DEVCON3 (2017) by Jan Xie
Ethereum Enterprise at DEVCON2 (2016), Panel Discussion

DEVCON1 (2015)
Rebuilding Enterprise with Blockchain at DEVCON1 (2015) by Deloitte
ETH in Enterprise at DEVCON1 (2015) by Taylor Gerring

EVM- Ethereum Virtual Machine:

KEVM Overview and Progress Report at DEVCON3 (2017) by Everett Hildenbrandt​
Evolving The EVM at DEVCON3 (2017) Panel Discussion

EVM Evolution at DEVCON2 (2016) by Pawel Bylica 

eWASM (Web Assembly):

DEVCON 4 (2018)
Ewasm: Ethereum-Flavored Web Assembly at DEVCON4 (2018) Panel Discussion

​DEVCON 3 (2017)

DEVCON 2 (2016)
EVM & Web Assembly at DEVCON2 (2016) by Martin Becze
Ethereum Web Assembly at DEVCON2 (2016) by Alex Beregszaszi

DEVCON 1 (2015)
WebAssembly at DEVCON1 (2015) by Martin Becze

Git:

Mango - Git Completely Decentralized at DEVCON2 (2016) by Alex Beregszaszi

Governance:

The Future of Token Contracts: MiniMe, Governance, LiquidPledging & ERC223 at DEVCON3 (2017) by Jordi Baylina

IC3:

IC3 – Crypto Bootcamp Project Presentations at DEVCON3 (2017) by Phil Daian, Everett Hildenbrandt, Loi Luu, and Haseeb Qureshi 

IPFS:

IPFS & Ethereum at DEVCON2 (2016) by Juan Benet
libp2p ❤ devp2p: IPFS + Ethereum at DEVCON2 (2016) by Juan Benet ​

IPFS at DEVCON1 (2015) by Juan Benet

Light Clients:

Mustekala Project: MetaMask To Become A Light Llient Over libp2p at DEVCON4 (2018) by Frankie Pangilinan and Dmitiry Ryajov

Messaging:

Parallelizing Deterministic Message Processing at DEVCON3 (2017) by Martin Becze

Music:

Ujo Music at DEVCON1 (2015), by Phil Barry 

Name Service:

​ENS Ethereum Name Service On-boarding Booth at DEVCON4 (2018) by Beltran Berrocal and Makoto Inoue

ENS Ethereum Domain Name System  at DEVCON2 (2016) by Nick Johnson 

Namespace at DEVCON1 (2015) by Ryan Casey

Oracle:

How to design Auditable Offchain computations via Oraclize at DEVCON3 (2017) by Thomas Bertani 

Provably Honest Oracle Model at DEVCON2 (2016) by Thomas Bertani

​Provable Honest Oracle Services at DEVCON1 (2015) by Thomas Bertani

Package Management:

EVM Packages: using OpenZeppelin from ZeppelinOS at DEVCON4 (2018) by Santiago Palladino
Managing Upgradeability and EVM Packages at DEVCON4 (2018) by Facundo Spagnuolo

Package Management for Smart Contracts at DEVCON3 (2017) by Piper Merriam 

Marmot-y Goodness and Ethereum Package & Chain Management at DEVCON2 (2016) by RJ Catalano and Zach Ramsey

Programming Languages:

DEVCON4 (2018)​
Solidity Compiler Audit Post-Mortem at DEVCON4 (2018), by ​Manuel Araoz 
Yul - Intermediate language for Ethereum at DEVCON4 (2018) by Alex Beregszaszi

DEVCON3 (2017)​
Julia: IR for Eth Contracts at DEVCON3 (2017) by Alex Beregszaszi

Registries:

Registries (Gnosis) at DEVCON1 (2015), by Niran Babalola

Regulation:

Coin Center; Regulation at DEVCON3 (2017) by Jerry Brito
​Regulatory Update and Look Ahead at DEVCON3 (2017) by Jerry Brito and Peter Van Valkenburgh
​
Regulatory Considerations for DApp Development at DEVCON2 (2016) by Peter Van Valkenburgh

Security:

DEVCON 4 (2018)
Smart Contract Security - Incentives Beyond the Launch at DEVCON4 (2018) by Phil Daian 
Fraud Proofs: Maximising Light Client Security and Scaling Blockchains with Dishonest Majorities at DEVCON4 (2018) by Mustafa Al-Bassam
Current State of Security at DEVCON4 (2018) Panel Discussion​

DEVCON 3 (2017)
Evolution of Smart Contract Security in Eth Ecosystem at DEVCON3 (2017), by Manuel Araoz 
Ledger- Hardening Smart Contracts With Hardware Security at DEVCON3 (2017) by Nicolas Bacca
Enter the Hydra – An Experimental Approach to Smart Contract Security at DEVCON3 (2017) by Phil Daian
Melon Security Approach at DEVCON3 (2017) by Mona El Isa and Reto Trinkler
Securify: Not Your Gma's Smart Contract Verification at DEVCON3 (2017) by Quentin Hibon
Morphing Smart Contracts with Bamboo at DEVCON3 (2017) by Yoichi Hirai 
Designing Future-proof Smart Contract Systems at DEVCON3 (2017) by Jorge Izquierdo
Ethereum Security at DEVCON3 (2017), by Martin Swende

DEVCON 2 (2016)
Understanding, Developing & Securing Smart Contracts at DEVCON2 (2016) by Phil Daian

DEVCON 1 (2015)
Contract Oriented Programming Modularity, Extensibility, & Security Custom at DEVCON1 (2015) by Peter Borah
Securing Ethereum at DEVCON1 (2015) by Jutta Steiner and Gustav Simonsson

Smart Contracts:

Smart Contracts- Approach With Caution at DEVCON4 (2018) by Jake Craige

State Channels:

State Channels for Blockchain DEVCON2 (2016) by Jeff Coleman

​Hash Time DEVCON1 (2015) by Jeff Coleman

Supply Chain:

Building a Supply Chain on ETH Mainet at DEVCON3 (2017) by Guiseppe Bertone

​Provenance at DEVCON1 (2015), by Jessi Baker

Tokens:

0x: an open protocol for trustless, low friction exchange of ERC20 tokens at DEVCON3 (2017) by Will Warren

Tokens at DEVCON1 (2015) by ​Simon de la Rouviere

Verification:

Scalable Onchain Verification for Authenticated Data Feeds at DEVCON3 (2017) by Thomas Bertani
Verifying Casper at DEVCON3 (2017) by Yoichi Hirai 
Formal Verification at DEVCON3 (2017) Panel Discussion

Imandra Verification System at DEVCON2 (2016) by Grant Passmore
Formal Verification in Solidity at DEVCON2 (2016) by Yoichi Hirai 
​
Imandra Verification at DEVCON1 (2015) by Grant Passmore