GrapheneOS / Auditor
Hardware-based attestation and intrusion detection app for Android. It provides both local verification with another Android device via QR codes and optional scheduled server-based verification with support for alert emails. It uses hardware-backed keys and attestation support as the foundation and chains trust to the app for software checks.
rememberber / WePush
专注批量推送的小而美的工具，目前支持：模板消息-公众号、模板消息-小程序、微信客服消息、微信企业号/企业微信消息、阿里云短信、阿里大于模板短信 、腾讯云短信、云片网短信、E-Mail、HTTP请求、钉钉、华为云短信、百度云短信、又拍云短信、七牛云短信
deltachat / deltachat-android
Decentralized private messenger with chat-shared tools and games for Android
bbottema / simple-java-mail
Simple API, Complex Emails (Jakarta Mail smtp wrapper)
apache / james-project
Emails at the heart of your business logic!
mguessan / davmail
DavMail POP/IMAP/SMTP/CalDAV/CardDAV/LDAP Exchange and Office 365 Gateway - Synced with main subversion repository at
greenmail-mail-test / greenmail
Official master for the Greenmail project
supertokens / supertokens-core
Open source alternative to Auth0 / Firebase Auth / AWS Cognito
M66B / FairEmail
Fully featured, open source, privacy friendly email app for Android