Synapse's one liner is: a Layer2 roll-up cross-chain / multi-chain and bridge connecting EVM and non-EVM. It even allows to make a smart-contract call on one chain and execute it on another (cross chain messaging).
Also launching soon SynChain that will let other projects to build on its technology. A lot of new use-cases will rise from this.
Here the investment memo : https://docs.google.com/document/d/1N9tkjhEhc3tTM5mnMYNWwl7M6zYy_ZZwX_L_lH4F8H4/edit?usp=sharing
Here the full in-depth fundamental analysis : https://docs.google.com/document/d/196SJ98_pnFVOrXbYMTKNpzHUJUJMFV7b5cMnFeXIf4w/edit?usp=sharing