Collaboration & Productivity Tools
ubertesters.com
Test platform, integration and crowd testers, 2 projects, five members
testlio.com
Issue tracking, test management and beta testing platform. Free for private use
Apidog
GUI tool for API mocking, testing (scenario testing, functional testing, performance testing, etc.)
Speakeasy
API tooling for SDKs, API docs, Terraform providers, and end-to-end testing. 
Bump.sh
API documentation and change management solution
DeveloperHub
Collaborative developer documentation platform
Swimm
Docs that are coupled with your code, auto-synced, works with your IDE
cally.com
Find the perfect time and date for a meeting. Simple to use, works great for small and large groups
seafile.com
Private or cloud storage, file sharing, sync, discussions. The cloud version has just 1 GB
typetalk.com
Share and discuss ideas with your team through instant messaging on the web or your mobile
talky.io
Free group video chat. Anonymous. Peer‑to‑peer. No plugins, signup, or payment required
helplightning.com
Help over video with augmented reality. Free without analytics, encryption, support