Core Insights - The article discusses various small-scale side projects that individuals are pursuing to earn an additional income of $500 per month by 2025, emphasizing simplicity and addressing real pain points without heavy advertising reliance [1][52]. Group 1: Project Summaries - **JustFax Online**: A minimalistic online fax service that charges a one-time fee per use, targeting industries like healthcare and legal that still utilize faxing. It generates over €500 monthly through SEO and payment processing via Stripe [2]. - **NotebookLM Web Importer**: A Chrome extension that allows users to import web content into Google’s NotebookLM. After launching a paid feature in July, it has over 100,000 users and earns more than $500 monthly [6][7]. - **Dream and Color**: An AI tool that transforms photos into printable coloring pages, targeting parents and teachers. It has shown a monthly growth rate of 10-20% and is profitable with minimal marketing [9][10]. - **DedupX**: A macOS application that helps photographers find duplicate and visually similar photos, charging an annual fee of $5.99 or a lifetime fee of $16.99. It has over 100 paying users [14][15]. - **Clues by Sam**: A daily logic puzzle game that generates puzzles algorithmically and manually, ensuring unique solutions. It relies on word-of-mouth for growth [18][19]. - **Filestash**: An open-source web file manager that allows users to mount various backend storage as a web disk, monetizing through custom development and paid plugins [22][25]. - **Video Hub App**: A local video library manager that allows users to browse and manage videos, available as a one-time purchase for $5 [28]. - **OnlineOrNot**: A monitoring service for websites and APIs that generates over $500 monthly since 2022, requiring only two hours of daily development [32][33]. - **Cold Call Gym**: An AI sales training platform that helps users practice sales calls, offering a free trial and a paid subscription for extended features [35][36]. - **Escape Team**: A printable escape room game designed for tabletop enthusiasts, with each task priced at $2.99 for permanent access [41][42]. - **Unli.xyz Series**: A price tracking service for storage devices on eBay, utilizing regex to parse product listings and earning commissions through affiliate links [46][48]. Group 2: Common Themes - The projects highlighted share a common theme of addressing overlooked needs with simple yet effective solutions, demonstrating that focusing on niche markets can yield significant returns [52].