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personalDNSfilter is a DNS filter proxy written in Java. It hooks into domain name resolution and returns the loopback address for filtered hosts. It supports secure DNS via DOH and DOT and is available for Java enabled devices including Android, with and without VPN. Filtering is local and works with any upstream DNS server.
Server World is a site for people who build network servers with operating systems such as CentOS, Ubuntu, Fedora, Debian and Windows Server. It publishes configuration guides covering Ubuntu installation, NTP and SSH servers, DNS and DHCP servers, and storage servers.
IntoDNS.AI is a DNS and mail server checker that reports on SPF, DKIM, DMARC, DNSSEC, MTA-STS, BIMI, FCrDNS and blacklists. It also offers a free public REST API for DNS and email security scans, with JSON and Markdown reports. The service states it is not affiliated with intodns.com.
OSINT.SH is a collection of information gathering tools. It lists tools for finding public cloud buckets, subdomains, DNS history, reverse IP lookups, technology detection, certificate searches, DNS lookups, reverse Google Analytics and AdSense IDs, WHOIS history, reverse WHOIS, reverse domain searches, OCR text extraction, MD5 hash guessing, SSL checking, IP geolocation, and reverse MX and name server records.
A DNS-based URL redirection service. Two DNS records describe a redirect: a CNAME or A record points the hostname at the service server, and a TXT record gives the redirect rule. Rules support permanent and temporary redirects, path matching and wildcards, and destinations can use http, https, ftp, mailto, magnet or absolute paths. HTTPS certificates are issued automatically by Let's Encrypt.
Outline is a tool for creating and running a personal VPN server. It consists of Outline Manager, a desktop application for setting up a server and sharing access keys, and Outline Client, an app for connecting to the server on mobile or desktop. Outline is open source and designed to be resistant to blocking, including DNS, content, and IP blocking.
Mail-in-a-Box turns a fresh cloud computer into a working mail server, letting users run their own mail service. It provides webmail, an IMAP/SMTP server, contacts and calendar synchronization, and a control panel. It also offers spam filtering, mail filter rules, automated backups, automatic DNS configuration, and support for multiple users and domain names.
PCAPdroid is an Android packet capture tool with dump modes including HTTP server, PCAP file, UDP exporter and TCP exporter. It supports TLS decryption and advanced features such as DNS server, DoH support, IPv6 support, root capture and extensions. Some features, including Firewall, Malware Detection and Pcapng Format, are paid.
Pi-hole is a network-wide ad blocker installed in one place so every device on a network is protected. It runs in Docker or on a supported Linux distribution and is used as a DNS server, with a web interface, built-in DHCP server, group management and allow/deny domain rules. Pairing it with a VPN extends protection on mobile data and public Wi-Fi.
Webmin is a web-based system administration tool for Unix-like servers. It can configure operating system internals such as users, disk quotas, services and configuration files, and control open-source applications including BIND DNS Server, Apache HTTP Server, PHP and MySQL.
4everproxy is a web proxy and VPN service that hides the IP address while browsing. The web proxy requires no additional software. Premium VPN plans list unlimited bandwidth, all server locations, eight active devices and private DNS. The VPN application is available for Windows and Android; other devices use OpenVPN.
Check-Host.net is an online tool for checking the availability of websites, servers, hosts and IP addresses. It offers domain and IP location data from geolocation databases and whois, ping to measure latency and packet loss from servers worldwide, HTTP response checks, DNS record retrieval, TCP and UDP port checks, a subnet calculator, a live server terminal for diagnostics, and API documentation for building monitoring solutions.
Comfy.Guide is a collection of computer guides. Its server software section covers self-hosting services such as email, DNS, IRC, Matrix, XMPP and PeerTube. Its client software section covers desktop tasks, including disk encryption, GnuPG, the KISS Linux distribution and using NVIDIA on Linux.
Email Dossier is a validation tool that checks an email address by walking through the process of sending email without actually sending any. It checks address syntax, looks up the domain's mail servers and tries contacting them. It reports a confidence rating from 0 to 3, error codes, a canonical address and MX records.
LandChad.net is a site that guides normal people through setting up websites, email servers and chat servers. Its basic course covers a domain name, a server, DNS records, an NginX webserver and Certbot with HTTPS, and it also lists self-hosted services.
PiVPN is a set of shell scripts designed to set up and manage a VPN on a Raspberry Pi, and the installer also works on Ubuntu or Debian. It allows customization of the VPN port, key encryption strength and client DNS server, and provides a pivpn command for adding or revoking client profiles.
Streisand is an app for using proxy servers through a clean interface for configuring proxy protocols. Users can create rule-based setups to direct traffic through specific proxies and use custom DNS settings, organizing and controlling how the internet connection is routed. Supported protocols include VLESS, VMess, Trojan, Shadowsocks, Socks, SSH, Hysteria, TUIC and Wireguard.
